CN110986203A - Constant temperature and humidity air conditioning system for cooling variable frequency multi-connected floor heating air duct machine - Google Patents

Abstract

The invention provides a constant-temperature and constant-humidity air conditioning system for cooling a variable-frequency multi-connected floor heating air duct machine, which is used for solving the problems that an air conditioning unit is complex and complicated to install and debug, resources are wasted due to excessive dehumidification, the requirement of individuation of temperature and humidity of a single room cannot be met, the problems of dehumidification and the like when the air conditioning unit is matched with a floor radiation refrigeration heating system cannot be well solved. The device comprises a compression device, a heat exchange device, a throttling device and a cooling and heating device, wherein the cooling and heating device comprises a cooling and dehumidifying unit and a heating unit, the compression device, the heat exchange device and the throttling device are connected with a main control board, the main control board is connected with a sub-controller, and the sub-controller is connected with a temperature sensing probe I, a humidity sensing probe and a temperature sensing probe II. The invention can provide different energy supplies according to different requirements of a single room, and the outdoor host machine can change the operation state in due time according to the indoor requirements, thereby meeting the energy supply and saving energy for operation.

Description

Constant temperature and humidity air conditioning system with variable frequency multi-connected floor heating duct machine for cooling

technical field

The invention relates to the technical field of indoor refrigeration and heating, in particular to a constant temperature and humidity air conditioning system for cooling down by a variable frequency multi-connected floor heating air duct machine.

Background technique

At present, with the rapid development of technological innovation and manufacturing technology, in the field of heat pump compressors, the advent of digital scroll compressors and two-stage compression compressors enables the heat pump system to operate stably at outdoor temperatures below -30°C, and It has a high operating energy efficiency ratio and operating stability, which opens up a new way for the use of air source heat pumps in the heating field. In the patents with application numbers of ZL 2008 20071027.X, ZL201010502398.0, ZL201220275353.9, ZL201220275358.1 and ZL200820071026.5, etc., in-depth research on phase change radiant heating has been carried out, although the corresponding system results have been obtained. The cooling and heating operation is energy-saving and stable, but the outdoor unit is a fixed-frequency air-conditioning system, and the single-unit power is small. To achieve heating, cooling, and dehumidification in a room with multiple units, it requires the coordination of several air conditioners. With changes in demand, building style and appearance requirements, the owner or construction unit is not allowed to hang multiple outdoor units on the facade. The frequency conversion system is simple and practical, and a large frequency conversion direct expansion cooling and heating central air conditioning system is very much needed in many places in the vast area of our country. The traditional fixed-frequency heat pump cannot perform dehumidification at the same time as the floor direct expansion cooling, and cannot meet the individual needs of the temperature and humidity of a single room; the traditional air-conditioning unit cools the room and dehumidifies the room through cooling operation in summer, which often occurs in order to reduce the indoor temperature. And cause excessive dehumidification, people feel uncomfortable and cause energy waste. The large-scale air duct system has complicated pipeline installation and high installation cost. When the conveying distance is long, the air supply or return air volume will be greatly affected, and the cooling or heat of the heat exchanger connected to the main machine cannot be discharged in time, resulting in icing and other undesirable phenomena. , the working state of the system is unstable, and the dehumidification unit matched with the floor phase change radiation cooling and heating system is not mature. The current unit needs 2~3 units to complete the radiant heating, cooling and heat exchange system supplying circulating medium to the floor or wall panel, and at the same time circulating dehumidification. The installation and debugging are very complicated, and any current unit or system cannot It is a good solution to the problem of dehumidification when it is matched with the floor radiant cooling and heating system.

SUMMARY OF THE INVENTION

Aiming at the complex and tedious installation and debugging of the air-conditioning unit, the waste of resources caused by excessive dehumidification, the inability to meet the individual requirements of the temperature and humidity of a single room, and the inability to well solve the problems of dehumidification when it is matched with a floor radiant cooling and heating system, a method is proposed. The constant temperature and humidity air-conditioning system with frequency conversion multi-connected floor heating and air duct machine cooling and dehumidification realizes the cooling, heating and dehumidification that uses floor heating in winter and floor and air duct machine for cooling and dehumidification in summer. Different energy supply, the outdoor host can also timely change the operation status according to the indoor demand, which can not only meet the energy supply but also save energy.

In order to solve the above-mentioned technical problems, the present invention adopts the following technical solutions: a constant temperature and humidity air conditioning system for cooling down by a variable frequency multi-connected floor heating air duct machine, including a compression device, a heat exchange device, a throttling device and a cooling and heating supply device. The compression device, the heat exchange device, the throttling device and the cooling and heating supply device are connected in series in sequence, wherein the compression device and the heat exchange device are both arranged in the outdoor main engine, the cooling and heating supply device is arranged indoors, and the cooling and heating supply device is arranged in the room. The device includes a cooling and dehumidification unit and a heating unit, and the cooling and dehumidification unit and the heating unit are arranged in parallel, the compression device, the heat exchange device and the throttling device are all connected to a controller, and the controller is connected with a temperature for detecting indoor temperature. Temperature sensor probe I, humidity sensor probe used to detect indoor humidity and temperature sensor probe II used to detect floor temperature.

The compression device includes a compressor, the compressor is respectively connected with a four-way valve and a liquid storage tank, and the four-way valve is connected with the liquid storage tank, the four-way valve is connected with the heat exchange device, and the four-way valve is connected with the liquid supply pipe through the The heating unit is connected, and the compressor and the four-way valve are both connected to the controller; the heat exchange device includes a heat exchanger I and a fan I matched with the heat exchanger I, the fan I is connected to the controller, and the heat exchanger I is connected to the controller. The heat exchanger I is connected with the four-way valve, and the heat exchanger I is respectively connected with the cooling and dehumidification unit and the heating unit through the liquid return pipe; the throttling device includes an electronic expansion valve I, and the electronic expansion valve I is connected with the heat exchanger I, And the electronic expansion valve I is connected with the cooling and dehumidification unit through the liquid return pipe, and the electronic expansion valve I is connected with the controller.

The cooling and dehumidification unit includes an indoor air duct machine, and the indoor air duct machine is provided with a heat exchanger II and a fan II matched with the heat exchanger II, the fan II is connected to the controller, and the heat exchanger II is connected to the return. The front part, the middle part and the rear part of the fluorine pipe pipeline at one end of the liquid pipe connection are provided with temperature sensing probe III, and the temperature sensing probe III is connected with the controller.

The controller includes a main control board and a sub-controller, and the sub-controller is connected to the main control board, the main control board is installed on the inner side of the casing of the outdoor main unit, and the sub-controller is installed on the inner side of the casing of the indoor air duct machine. The compressor, four-way valve, fan I and electronic expansion valve I are all connected to the main control board, and temperature probe I, humidity probe, temperature probe II, temperature probe III and fan II are all connected to the sub-control. device connection.

The heating unit is respectively connected with the heat exchanger II and the liquid supply pipe through the tee pipe II, and is respectively connected with the heat exchanger II and the liquid return pipe through the tee pipe I; the trunk of the tee pipe I is connected with the liquid return pipe. Connection, one branch of the tee pipe I is connected to the heating unit, and the other branch is connected to the heat exchanger II through the connecting pipe; the trunk of the tee pipe II is connected to the liquid supply pipe, and one branch of the tee pipe II is connected to The heating unit is connected, and the other branch is connected with the heat exchanger II through the connecting pipe.

One branch of the three-way pipe I is provided with an electronic expansion valve IV, and the other branch is provided with an electronic expansion valve II, and the electronic expansion valve IV is connected with the heating unit, and the electronic expansion valve II is connected with the heat exchanger II. One branch of the three-way pipe II is provided with an electronic expansion valve V, and the other branch is provided with an electronic expansion valve III, and the electronic expansion valve V is connected with the heating unit, and the electronic expansion valve III is connected with the heat exchanger II. Electronic expansion valve II, electronic expansion valve III, electronic expansion valve IV and electronic expansion valve V are all connected with the sub-controller.

A filter is arranged between the four-way valve and the liquid supply pipe, a stop valve I is arranged on the liquid return pipe, a stop valve II is arranged on the liquid supply pipe, and the stop valve II is located between the filter and the heating unit; The outside of the pipeline connected between the heat exchanger I, the compressor, the electronic expansion valve I, the stop valve I and the stop valve II, as well as the electronic expansion valve I, the electronic expansion valve II, the electronic expansion valve III, the electronic expansion valve The exterior of IV and electronic expansion valve V are wrapped with thermal insulation cotton.

The heating unit includes a buried coil pipe, the outlet end of the buried coil pipe is respectively connected with the heat exchanger II and the liquid return pipe through the tee pipe I, and the inlet end is respectively connected with the heat exchanger II and the liquid supply pipe through the tee pipe II. Tube connection.

The cooling and heating device is provided with at least two groups, which are connected in parallel in sequence. Each group of cooling and heating devices includes a cooling and dehumidification unit and a heating unit. The cooling and dehumidification unit and the heating unit are arranged in parallel, and the heating unit includes a ground. Buried coil, the outlet end of the buried coil is connected to the heat exchanger II and the liquid return pipe respectively through the tee pipe I, and the inlet end is respectively connected to the heat exchanger II and the liquid supply pipe through the tee pipe II.

The cooling and heating devices are provided with at least two groups, which are connected in parallel in sequence. Each group of cooling and heating devices includes a cooling and dehumidification unit and a heating unit. The two buried coils are connected in parallel. The outlet ends of the two buried coils are respectively connected with the heat exchanger II and the liquid return pipe through the tee pipe I, and the inlet ends are respectively connected with the heat exchange pipe through the tee pipe II. The device II is connected with the liquid supply pipe.

The present invention with the above structure can not only supply circulating medium to the working fluid of the floor or wall panel for direct radiant heating, cooling and heat exchange, but also can circulate the indoor air, so as to realize the use of floor heating in winter and the use of floor heating in summer. The floor and the air duct machine can provide cooling, heating and dehumidification for cooling and dehumidification. At the same time, it can provide different energy supply according to the different needs of a single room. The outdoor host can also change the operation status in time according to the indoor demand, which can not only meet the energy supply but also save energy. The requirements of dehumidification, cooling and heating; the present invention is easy to install and use, has stable working performance, low input power, high energy efficiency ratio, energy saving, environmental protection and low noise, and has strong practicability.

Description of drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to these drawings without creative efforts.

1 is a schematic structural diagram of Embodiment 1 of the present invention;

2 is a schematic structural diagram of Embodiment 2 of the present invention;

FIG. 3 is a schematic structural diagram of Embodiment 3 of the present invention.

In the figure, 1 is 1 is the outdoor host, 2 is the heat exchanger I, 4 is the compressor, 5 is the four-way valve, 6 is the main control board, 8 is the fan I, 9 is the liquid return pipe, and 10 is the liquid supply pipe , 11 is the electronic expansion valve II, 12 is the electronic expansion valve III, 13 is the electronic expansion valve IV, 14 is the electronic expansion valve V, 16 is the sub-controller, 17 is the indoor air duct machine, 18 is the heat exchanger II, 19 is fan II, 22 is temperature sensing probe II, 25 is temperature sensing probe I, 26 is humidity sensing probe, 27 is temperature sensing probe III, 40 is buried coil, 61 is liquid storage tank, 62 is filter 63 is a stop valve I, 64 is a stop valve II, 70 is an electronic expansion valve I, 94 is a three-way pipe I, and 95 is a three-way pipe II.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below 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, but not all of 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.

Example 1

As shown in FIG. 1 , the present invention provides a constant temperature and humidity air conditioning system for cooling down by a variable frequency multi-connected floor heating air duct machine, including a compression device, a heat exchange device, a throttling device and a cooling and heating device, wherein the compression device and The heat exchange devices are all arranged in the outdoor host 1, and the cooling and heating supply devices are arranged indoors. The compression device, the heat exchange device, the throttling device, and the cooling and heating supply device are sequentially connected in series. The cooling and heating supply device includes: The cooling and dehumidification unit and the heating unit, and the cooling and dehumidification unit and the heating unit are arranged in parallel, so that the floor (wall panel, floor) heat exchange system can be directly supplied by the working fluid to heat up or cool down the floor, and the air duct machine can cool the indoor air. The circulating air is filtered, dehumidified, cooled, and heated to achieve the cooling, heating and dehumidification needs of the indoor system.

The compression device, the heat exchange device and the throttling device are all connected to the controller, and the controller is connected with a temperature sensing probe I25 for detecting indoor temperature, a humidity sensing probe 26 for detecting indoor humidity, and a temperature sensing probe 26 for detecting floor temperature. The temperature sensor II22, specifically, the controller includes a main control board 6 and a sub-controller 16, and the sub-controller 16 is connected to the main control board 6, and the main control board 6 is installed on the inside of the casing of the outdoor host 1. , the compression device, heat exchange device and throttling device are all connected with the main control board 6, and the temperature sensing probe I22, the temperature sensing probe II25 and the humidity sensing probe 26 are all connected with the sub-controller 16, and the sub-controller 16 uses In order to receive the information detected by the temperature sensing probe I22, the temperature sensing probe II25 and the humidity sensing probe 26, the main control board 6 is used to control the working state of the compression device, the heat exchange device and the throttling device. The sub-controller 16 is connected with the control device by wired or wireless means, and the sub-controller 16 can be used to control indoor temperature parameters, switch status, function selection, etc. , The information detected by the temperature sensing probe II 25 and the humidity sensing probe 26 is fed back to the control device for the user to view, and the user can also issue an instruction to the sub-controller 16 through the control device to complete the setting of the relevant parameters, while the sub-controller After receiving the instruction, 16 transmits the information to the main control board 6, and the main control board 6 controls the compression device, the heat exchange device and the throttling device to work, so as to realize the mutual conversion of cooling and heating, and automatically adjust or change the energy supply state. The inside of the casing of the outdoor host 1 is also provided with a power supply, and the compression device, the heat exchange device, the throttling device, the main control board 6 and the sub-controller 16 are all connected to the power supply. The throttling device, the main control board 6 and the sub-controller 16 provide power.

The compression device includes a compressor 4, the compressor 4 is respectively connected with a four-way valve 5 and a liquid storage tank 61, and the four-way valve 5 is connected with the liquid storage tank 61, and the compressor 4 and the four-way valve 5 are connected with the main valve. The control board 6 is connected, and the main control board 6 controls the compressor 4 and the four-way valve 5 to work, thereby realizing the mutual conversion between cooling and heating. The four-way valve 5 is connected to the heat exchange device, and the four-way valve 5 is connected to the heating unit through the liquid supply pipe 10. Specifically, the heat exchange device includes a heat exchanger I2 and a fan I8 matched with the heat exchanger I2, The fan I8 is connected to the main control board 6, and the fan I8 is beneficial to promote the process of heat exchange of the heat exchanger I2, so that the indoor air circulates continuously to achieve the purpose of heating and heating. The heat exchanger I2 is connected to the four-way valve 5, and the heat exchanger I2 is respectively connected with the cooling and dehumidification unit and the heating unit through the liquid return pipe 9, so as to realize the functions of refrigeration, dehumidification and heating; the liquid storage tank 61 is used for storage The condensate of the heat exchanger I2 avoids that the condensate accumulates too much in the heat exchanger I2, which reduces the heat transfer area and affects the heat transfer effect of the heat exchanger I2. The throttling device includes an electronic expansion valve I70, which is connected with the heat exchanger I2, and the electronic expansion valve I70 is connected with the cooling and dehumidification unit through the liquid return pipe 9, and the electronic expansion valve I70 is connected with the main control board 6. Under the control of the main control board 6, the electronic expansion valve I70 can adjust the refrigerant flow in the heat exchanger I2 in time and control the target superheat degree, so as to prevent the compressor 4 from being damaged due to liquid hammer when inhaling, and to ensure the compression of the compressor 4. The service life of the machine 4 and the stable operation of the entire system.

The cooling and dehumidifying unit includes an indoor air duct machine 17. The indoor air duct machine 17 is provided with a heat exchanger II18 and a fan II19 matching the heat exchanger II18. The fan II19 is connected to the sub-controller 16, and the fan II19 is connected to the sub-controller 16. The controller 16 is connected, and the fan II 19 is beneficial to promote the process of heat exchange of the heat exchanger II 18, so that the indoor air circulates continuously to achieve the purpose of heating and heating. The heat exchanger II18 is respectively connected with the liquid return pipe 9 and the heating unit through the tee pipe I94, and is respectively connected with the liquid supply pipe 10 and the heating unit through the tee pipe II95, so as to realize the mutual conversion of cooling or heating. Preferably, the front part, the middle part and the rear part of the fluorine pipe pipeline at the end of the heat exchanger II18 connected to the liquid return pipe 9 are provided with temperature sensing probe III27, and the temperature sensing probe III27 is connected to the sub-controller. 16 connections. The temperature sensing probe III27 is used to sense the temperature of the refrigerant inside the fluorine tube of the heat exchanger II18, and transmit the detection information to the sub-controller 16, and the sub-controller 16 adjusts the relevant parameters according to the detected temperature information. and settings.

The heating unit is respectively connected to the heat exchanger II18 and the liquid supply pipe 10 through the tee pipe II95, and is respectively connected to the heat exchanger II18 and the liquid return pipe 9 through the tee pipe I94. Specifically, the heating unit includes an underground plate. Pipe 40, the outlet end of the buried coil 40 is connected to the heat exchanger II18 and the liquid return pipe 9 respectively through the tee pipe I94, and the inlet end is respectively connected to the heat exchanger II18 and the liquid supply pipe 10 through the tee pipe II95, so that the The heating liquid can circulate evenly and stably, so as to achieve uniform floor heating. Specifically, the trunk of the three-way pipe I94 is connected to the liquid return pipe 9, one branch of the three-way pipe I94 is connected to the heating unit, and the other branch is connected to the heat exchanger II18 through the connecting pipe; The trunk is connected with the liquid supply pipe 10, one branch of the tee pipe II95 is connected with the heating unit, and the other branch is connected with the heat exchanger II18 through the connecting pipe. As a further preferred solution, one branch of the three-way pipe I94 is provided with an electronic expansion valve IV13, and the other branch is provided with an electronic expansion valve II11, and the electronic expansion valve IV13 is connected to the heating unit, and the electronic expansion valve II11 is connected to the replacement. Heater II18 is connected, one branch of the three-way pipe II95 is provided with an electronic expansion valve V14, and the other branch is provided with an electronic expansion valve III12, and the electronic expansion valve V14 is connected with the heating unit, and the electronic expansion valve III12 and heat exchange The electronic expansion valve II11, electronic expansion valve III12, electronic expansion valve IV13 and electronic expansion valve V14 are all connected to the sub-controller 16. Electronic expansion valve II11, electronic expansion valve III12, electronic expansion valve IV13 and electronic expansion valve Valve V14 can be used as a control switch to control the liquid flow and flow direction, so as to automatically adjust the energy supply and ensure the stable operation of the entire system.

A filter 62 is arranged between the four-way valve 5 and the liquid supply pipe 10. The filter 62 can filter the impurities in the pipeline of the refrigeration system, and can be used to store and supply the liquid refrigerant in the refrigeration system, and compensate and adjust in time. Profit and loss of liquid refrigerants. The liquid return pipe 9 is provided with a stop valve I63, the liquid supply pipe 10 is provided with a stop valve II 64 and the stop valve II 64 is located between the filter 62 and the heating unit, and the stop valve I 63 and the stop valve II 64 are respectively used to control the outdoor unit. The flow direction of the refrigerant inside, so as to avoid the backflow or loss of the refrigerant. Preferably, the outside of the pipelines connected between the heat exchanger I2, the compressor 4, the electronic expansion valve I70, the stop valve I63 and the stop valve II64, as well as the electronic expansion valve I70, the electronic expansion valve II11, and the electronic expansion valve III12 , Electronic expansion valve Ⅳ13 and electronic expansion valve Ⅴ14 are wrapped with thermal insulation cotton. The thermal insulation cotton is used to prevent temperature loss and copper tube aging. If the thermal insulation cotton falls off a lot, the copper tube will be exposed for a long time, resulting in oxidation and blackening. The service life will also affect the use effect of the air conditioner.

Example 2

The present invention provides a constant temperature and humidity air conditioning system with variable frequency multi-connected floor heating air duct machines for cooling. As shown in FIG. 2 , the difference between this embodiment and Embodiment 1 is that the cooling and heating device is provided with at least There are two groups, which are connected in parallel in sequence, and each group of cooling and heating devices can be installed in multiple rooms to meet the individual temperature requirements of a single room. Each group of cooling and heating devices includes a cooling and dehumidification unit and a heating unit, and the cooling and dehumidification unit and the heating unit are arranged in parallel. It is connected with heat exchanger II18 and liquid return pipe 9 respectively, and the inlet end is connected with heat exchanger II18 and liquid supply pipe 10 respectively through tee pipe II95, so as to realize indoor heating, cooling, dehumidification, etc., to meet the needs of users.

Other structures and working principles are the same as those in Embodiment 1, and will not be repeated here.

Example 3

The present invention provides a constant temperature and humidity air conditioning system with variable frequency multi-connected floor heating air duct machines for cooling. As shown in FIG. 3 , the difference between this embodiment and Embodiment 1 and Embodiment 2 is that the cooling supply There are at least two groups of heating devices, which are connected in parallel in sequence. Each group of cooling and heating devices includes a cooling and dehumidification unit and a heating unit. The cooling and dehumidification unit and the heating unit are arranged in parallel. In multiple rooms, it can meet the personalized needs of the temperature of a single room. Compared with Embodiment 2, the heating unit in this embodiment includes two buried coils 40, which are connected in parallel. The heat exchanger II18 is connected to the liquid return pipe 9, the inlet end is connected to the heat exchanger II18 and the liquid supply pipe 10 respectively through the tee pipe II95, and the buried coils 40 in each group and the buried coils 40 are connected to the heat exchange. The devices II and 18 are connected through a plurality of three-way pipes, so as to realize indoor heating, cooling, dehumidification, etc., and effectively increase the heating area to meet the needs of users.

Other structures and working principles are the same as those in Embodiment 1, and will not be repeated here.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of the present invention. within the scope of protection.

Claims (10)

1. a constant temperature and humidity air-conditioning system with a frequency conversion multi-connected floor heating air duct machine cooling, it is characterized in that: comprise compression device, heat exchange device, throttling device and cooling and heating device, described compression device, heat exchange device , the throttling device and the cooling and heating device are connected in series in sequence, wherein the compression device and the heat exchange device are both arranged in the outdoor main engine (1), the cooling and heating device is arranged indoors, and the cooling and heating device includes a cooling and heating device. The dehumidification unit and the heating unit, and the cooling dehumidification unit and the heating unit are arranged in parallel, the compression device, the heat exchange device and the throttling device are all connected to a controller, and the controller is connected to a temperature sensing probe I for detecting indoor temperature (25), a humidity sensing probe (26) for detecting indoor humidity, and a temperature sensing probe II (22) for detecting floor temperature. 2 . The constant temperature and humidity air conditioning system for cooling the temperature of the variable-frequency multi-connected floor heating duct machine according to claim 1 , wherein the compression device comprises a compressor (4), and the compressors (4) are respectively connected with four-way links. 3 . The valve (5) is connected to the liquid storage tank (61), and the four-way valve (5) is connected to the liquid storage tank (61). The liquid pipe (10) is connected with the heating unit, the compressor (4) and the four-way valve (5) are connected with the controller; the heat exchange device includes a heat exchanger I (2) and a heat exchanger I ( 2) The matching fan I (8), the fan I (8) is connected to the controller, the heat exchanger I (2) is connected to the four-way valve (5), and the heat exchanger I (2) passes through the liquid return pipe (9) Connected to the cooling and dehumidification unit and the heating unit respectively; the throttling device includes an electronic expansion valve I (70), the electronic expansion valve I (70) is connected to the heat exchanger I (2), and the electronic expansion valve I (70) is connected to the heat exchanger I (2). (70) is connected with the cooling and dehumidification unit through the liquid return pipe (9), and the electronic expansion valve I (70) is connected with the controller. 3. The constant temperature and humidity air-conditioning system for cooling the temperature of the variable frequency multi-connected floor heating air duct machine according to claim 2, wherein the cooling and dehumidification unit comprises an indoor air duct machine (17), an indoor air duct machine (17) ) is provided with a heat exchanger II (18) and a fan II (19) matching the heat exchanger II (18), the fan II (19) is connected to the controller, and the heat exchanger II (18) is connected to the return The front part, middle part and rear part of the fluorine pipe pipeline at one end of the liquid pipe (9) are provided with temperature sensing probe III (27), and the temperature sensing probe III (27) is connected with the controller. 4. The constant temperature and humidity air-conditioning system for cooling the temperature of the variable frequency multi-connected floor heating air duct machine according to claim 3, characterized in that: the controller comprises a main control board (6) and a sub-controller (16), and the sub-controllers (16) The controller (16) is connected to the main control board (6), the main control board (6) is mounted on the inner side of the casing of the outdoor host (1), and the sub-controller (16) is mounted on the casing of the indoor air duct machine (17) Inside, the compressor (4), the four-way valve (5), the fan I (8) and the electronic expansion valve I (70) are all connected to the main control board (6). The sensing probe (26), the temperature sensing probe II (22), the temperature sensing probe III (27) and the fan II (19) are all connected to the sub-controller (16). 5. The constant temperature and humidity air-conditioning system for cooling the temperature of the variable frequency multi-connected floor heating air duct machine according to claim 4, wherein the heating unit is connected to the heat exchanger II (18) through the three-way pipe II (95) respectively. It is connected with the liquid supply pipe (10), and is respectively connected with the heat exchanger II (18) and the liquid return pipe (9) through the three-way pipe I (94); the trunk of the three-way pipe I (94) is connected with the liquid return pipe. (9) Connection, one branch of the three-way pipe I (94) is connected to the heating unit, and the other branch is connected to the heat exchanger II (18) through the connecting pipe; the trunk of the three-way pipe II (95) is connected to the liquid supply The pipe (10) is connected, one branch of the three-way pipe II (95) is connected with the heating unit, and the other branch is connected with the heat exchanger II (18) through the connecting pipe. 6. The constant temperature and humidity air-conditioning system for cooling the temperature of the variable frequency multi-connected floor heating air duct machine according to claim 5, characterized in that: one branch of the three-way pipe I (94) is provided with an electronic expansion valve IV (13 ), another branch is provided with an electronic expansion valve II (11), and the electronic expansion valve IV (13) is connected with the heating unit, and the electronic expansion valve II (11) is connected with the heat exchanger II (18); One branch of the pipe II (95) is provided with an electronic expansion valve V (14), the other branch is provided with an electronic expansion valve III (12), and the electronic expansion valve V (14) is connected to the heating unit, and the electronic expansion valve III (12) Connected to heat exchanger II (18), the electronic expansion valve II (11), electronic expansion valve III (12), electronic expansion valve IV (13) and electronic expansion valve V (14) are all controlled by device (16) is connected. 7. The constant temperature and humidity air-conditioning system for cooling the temperature of the variable frequency multi-connected floor heating air duct machine according to claim 6, wherein a filter is provided between the four-way valve (5) and the liquid supply pipe (10). (62), the liquid return pipe (9) is provided with a stop valve I (63), the liquid supply pipe (10) is provided with a stop valve II (64) and the stop valve II (64) is located in the filter (62) Between the heat exchanger I (2), the compressor (4), the electronic expansion valve I (70), the stop valve I (63) and the stop valve II (64) between the pipelines connected The exterior of the electronic expansion valve I (70), the electronic expansion valve II (11), the electronic expansion valve III (12), the electronic expansion valve IV (13) and the electronic expansion valve V (14) are all wrapped with thermal insulation cotton. 8 . The constant temperature and humidity air conditioning system for cooling and dehumidifying the variable frequency multi-connected floor heating duct machine according to claim 7 , wherein the heating unit comprises an underground coil (40), an underground coil (40) The outlet end is connected to the heat exchanger II (18) and the liquid return pipe (9) respectively through the tee pipe I (94), and the inlet end is respectively connected to the heat exchanger II (18) and the supply pipe through the tee pipe II (95). The liquid line (10) is connected. 9. The constant temperature and humidity air-conditioning system for cooling the temperature of the variable frequency multi-connected floor heating air duct machine according to claim 7, characterized in that: the cooling and heating device is provided with at least two groups, which are connected in parallel in sequence, and each group supplies The cooling and heating device includes a cooling and dehumidification unit and a heating unit, the cooling and dehumidification unit and the heating unit are arranged in parallel, the heating unit includes a buried coil (40), and the outlet end of the buried coil (40) passes through a tee pipe I (94) is respectively connected with the heat exchanger II (18) and the liquid return pipe (9), and the inlet end is respectively connected with the heat exchanger II (18) and the liquid supply pipe (10) through the tee pipe II (95). 10. The constant temperature and humidity air-conditioning system for cooling the temperature of the variable-frequency multi-connected floor heating duct machine according to claim 7, characterized in that: the cooling and heating device is provided with at least two groups, which are connected in parallel in sequence, and each group supplies power. The cooling and heating device includes a cooling and dehumidification unit and a heating unit, the cooling and dehumidification unit and the heating unit are arranged in parallel, the heating unit includes two buried coils (40) and connected in parallel, and the two buried coils are connected in parallel. The outlet end of the pipe (40) is respectively connected with the heat exchanger II (18) and the liquid return pipe (9) through the tee pipe I (94), and the inlet end is respectively connected with the heat exchanger II (18) through the tee pipe II (95). 18) Connect with the liquid supply pipe (10).

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