CN215372775U

CN215372775U - Industrial air constant temperature and humidity device

Info

Publication number: CN215372775U
Application number: CN202121670568.6U
Authority: CN
Inventors: 葛传金; 井良霄
Original assignee: Shandong Dongheng National Fiber New Material Co ltd; Shandong Donghang Colloidal Material Co ltd
Current assignee: Shandong Dongheng National Fiber New Material Co ltd
Priority date: 2021-07-22
Filing date: 2021-07-22
Publication date: 2021-12-31
Anticipated expiration: 2031-07-22

Abstract

The utility model provides an industrial air constant temperature and humidity device, relates to industrial environment equipment technical field, the on-line screen storage device comprises a base, fixedly connected with preheating cabinet and steam chest on the base, the preheating cabinet passes through the heat balance valve and connects the steam chest, and the steam chest passes through the steam hose to be connected with the air supply box, and the air supply box passes through the condensation hose to be connected with the preheating cabinet, and the whole cladding heat preservation of preheating cabinet, steam chest, air supply box surface.

Description

Industrial air constant temperature and humidity device

Technical Field

The utility model relates to the technical field of industrial environment equipment, in particular to an industrial air constant temperature and humidity device.

Background

The organic or inorganic fiber uses flowing air as working medium in the dry spinning process, plays the role of forming, collecting and stabilizing in the fiber forming process of the fiber, and has strict requirements on the precision of the humidity and the temperature of the air.

The existing humidifying technology is divided into isothermal humidification and isenthalpic humidification. Isothermal humidification has modes of electrode steam humidification and electric heating steam humidification, and isenthalpic humidification has modes of wet film humidification, high-pressure micro-mist humidification, ultrasonic humidification and the like. The enthalpy humidification principle has the advantages of low general humidification efficiency, low water utilization rate and incapability of accurately adjusting, and the air temperature is obviously reduced due to heat absorption of water evaporation in the humidification process, so that the enthalpy humidification principle cannot meet the requirements of the working conditions. The electrode steam humidifying device adopts the working principle that steam is generated by utilizing ion conduction heating in water, and the electrode steam humidifying device needs to be stopped to discharge sewage and replenish water every certain working time and cannot continuously operate. The working principle of the electric heating steam humidifying device is that an electric heating tube heats water to generate steam, the liquid level in a heating cavity is reduced to supplement water, the temperature in the heating cavity is reduced in the water supplementing process, the steam can be stopped generating, the normal humidification is carried out after the steam is heated to a boiling point, the humidification quantity fluctuates, and the stable operation cannot be realized. Therefore, there is a need for improvement in finding a method for continuously and stably performing isothermal humidification of air, accurately controlling the method, and maintaining the temperature of air stable during humidification.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the problems and provides an industrial air constant temperature and humidity device to solve the problem of high-precision and stable control of the humidity and the temperature of industrial air.

The technical scheme adopted by the utility model for solving the technical problems is as follows:

the utility model provides an industrial air constant temperature and humidity device, includes the base, fixedly connected with preheating cabinet and steam chest on the base, the preheating cabinet passes through the heat balance valve and connects the steam chest, and the steam chest passes through the steam hose to be connected with the supply-air box, and the supply-air box passes through the condensation hose to be connected with the preheating cabinet, and the whole cladding heat preservation of preheating cabinet, steam chest, supply-air box surface.

Furthermore, the heat-insulating layer is made of an inorganic heat-insulating material, the heat conductivity coefficient is less than or equal to 0.055W (m.k), and the steam hose and the condensation hose are made of one of rubber, polytetrafluoroethylene, silica gel and stainless steel corrugated pipes.

Further, a pressure sensor is installed on the upper portion of the steam box, a liquid level sensor and a first temperature sensor are installed on the left side of the steam box, a steam heating pipe is installed inside the steam box, and a second blowoff valve is installed at the bottom of the steam box.

Furthermore, the box body of the steam box is made of 304 stainless steel; the second blowoff valve adopts a tetrafluoro sealing gasket; the pressure sensor adopts a pressure joint made of 304 stainless steel and provided with a heat dissipation structure; the steam heating pipe adopts 321 stainless steel shell.

Further, exhaust valve is installed on the upper portion of the preheating box, a ball float valve is installed on the right side of the preheating box, a water inlet valve is connected to the right side of the ball float valve, a third temperature sensor is installed in the middle of the right side of the preheating box, a hot water heating pipe is installed inside the preheating box, a first sewage discharge valve is installed at the bottom of the preheating box, the preheating box body is made of 304 stainless steel, and the first sewage discharge valve is made of a tetrafluoro sealing gasket. The third temperature sensor is made of 304 stainless steel. The hot water heating pipe adopts a stainless steel shell. The preheating tank uses RO reverse osmosis purified water with the conductivity less than or equal to 10 mu S/cm.

Further, the fan is installed in air supply box left side, and the heat exchanger is installed in the inside left side of air supply box, and air supply bottom of the case portion leans on the left to install second temperature sensor, installs the steam spray tube in the middle of the air supply bottom of the case portion, and air supply bottom of the case portion leans on the right to install first humidity transducer, and the air supply box right side is installed and is flow equallyd divide the board.

Furthermore, the whole air supply box is made of a 304 stainless steel plate through bending, the fan is a centrifugal fan, the air volume is 4100-5400 m3/h, and the air pressure is 1200 Pa. The flow equalizing plate adopts a 304 stainless steel woven mesh or a pore plate structure.

Further, the steam spray pipe comprises a spray pipe shell, the left side of the spray pipe shell is a steam inlet and is connected with a steam box through a steam hose, a condensation backflow port is arranged at the bottom of the spray pipe shell close to the left side, a steam guide plate is arranged inside the spray pipe shell, steam nozzles are uniformly arranged on the upper portion of the spray pipe shell, the upper portion of the steam guide plate is a steam cavity, and the lower portion of the steam guide plate is a condensation backflow cavity.

Further, 321 stainless steel materials are selected for use to spray tube casing, steam guide plate, and the steam guide plate welding is inside the spray tube casing to keep apart and form upper portion steam chamber and lower part condensation backward flow chamber, steam guide plate right-hand member is 3mm for the horizontal axis of spray tube casing squint downwards, and the condensation backward flow mouth passes through the condensation hose and is connected with the preheating cabinet.

Furthermore, the heat balance valve comprises a valve body, a valve core is arranged in the valve body, a high-temperature cavity is arranged on the left side of the valve core, a low-temperature cavity is arranged on the right side of the valve core, the valve core is connected with a heat-sensitive push rod through an adjusting rod, and a heat-sensitive element is arranged at the rear part of the heat-sensitive push rod.

Furthermore, the high-temperature cavity is connected with the steam box, and the low-temperature cavity is connected with the preheating box. The valve body and the valve core are made of stainless steel or brass.

Further, install the switch board on the base, the switch board passes through signal cable connection level sensor, first temperature sensor, pressure sensor, second temperature sensor, humidity transducer, third temperature sensor, and the switch board passes through control cable connection hot water heating pipe, steam heating pipe, fan, and the switch board sets up display screen, operating button, program controller, power regulator, converter.

Further, the fan of the air supply box is a centrifugal fan.

Further, the air source connector is connected with the pressure regulating valve through a pipeline, the pressure regulating valve is connected with the flow regulating valve through a pipeline, the flow regulating valve is connected with the diffusion cavity through a pipeline, and the diffusion cavity is connected with the left side of the air supply box body through a flange.

The utility model has the beneficial effects that: the utility model not only solves the high-precision stable control of the industrial air humidity and temperature, but also especially solves the problems of fiber forming and diameter uniformity in the organic or inorganic fiber dry spinning process, provides powerful support for improving the yield and quality of a production line, and has remarkable economic benefit; the utility model solves the problem that the existing air humidification technology can not stably humidify, has the constant temperature function and is well suitable for the dry spinning process of organic or inorganic fibers; the utility model has high automation degree and high air constant temperature and humidity control precision; the utility model provides a steam spray pipe technology, which optimizes a steam-water separation structure; the utility model provides a temperature balance valve technology, which realizes self-operated adjustment without external power supply.

Drawings

FIG. 1 is a schematic diagram of the overall structure of the present invention;

FIG. 2 is a radial cross-sectional view of the steam nozzle;

FIG. 3 is an axial cross-sectional view of the steam nozzle;

FIG. 4 is a front view of the steam nozzle;

FIG. 5 is a schematic diagram of the thermal balancing valve arrangement of the components of the present invention;

FIG. 6 is a schematic structural diagram of embodiment 2 of the present invention;

in the figure: 1. a base; 2. a control cabinet; 3. a fan; 4. a heat exchanger; 5. a steam nozzle; 6. an air supply box; 7. a liquid level sensor; 8. a first temperature sensor; 9. a pressure sensor; 10. a second temperature sensor; 11. a steam hose; 12. a condensing hose; 13. a humidity sensor; 14. a flow equalizing plate; 15. an exhaust valve; 16. a float valve; 17. a water inlet valve; 18. a third temperature sensor; 19. a hot water heating pipe; 20. a preheating box; 21. a first waste valve; 22. a heat-insulating layer; 23. a thermal balancing valve; 24. a second blowoff valve; 25. a steam box; 26. a steam heating pipe; 27. a nozzle housing; 28. a condensing reflux port; 29. a steam deflector; 30. a steam jet; 31. a condensing reflux cavity; 32. a steam chamber; 33. adjusting a rod; 34. a heat-sensitive push rod; 35. a thermosensitive element; 36. a low temperature chamber; 37. a valve core; 38. a high temperature chamber; 39. a valve body; 40. a gas source connector; 41. a pressure regulating valve; 42. a flow regulating valve; 43. a diffusion chamber.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

As shown in fig. 1 to 5, the industrial air constant temperature and humidity device comprises a base 1, wherein a preheating box 20 and a steam box 25 are fixedly connected to the base, the preheating box 20 is connected with the steam box 25 through a heat balance valve 23, the steam box 25 is connected with an air supply box 6 through a steam hose 11, the air supply box 6 is connected with the preheating box 20 through a condensing hose 12, and an insulating layer 22 is integrally coated on the outer surfaces of the preheating box 20, the steam box 25 and the air supply box 6.

The scheme is refined, the heat-insulating layer 22 is made of an inorganic heat-insulating material, the heat conductivity coefficient is less than or equal to 0.055W (m.k), and the steam hose 11 and the condensation hose 12 are made of one of rubber, polytetrafluoroethylene, silica gel and stainless steel corrugated pipes.

In at least one embodiment, the upper part of the steam box 25 is provided with a pressure sensor 9, the left side of the steam box 25 is provided with a liquid level sensor 7 and a first temperature sensor 8, the steam box 25 is internally provided with a steam heating pipe 26, and the bottom of the steam box 25 is provided with a second blowdown valve 24.

The scheme is refined, and the box body material of the steam box 25 adopts 304 stainless steel; the second blowdown valve 24 adopts a tetrafluoro sealing gasket; the pressure sensor 9 adopts a pressure joint of a 304 stainless steel material with a heat dissipation structure; the steam heating pipe 26 adopts an electric heating mode 321 stainless steel shell.

In at least one embodiment, the upper part of the preheating box 20 is provided with an exhaust valve 15, the right side of the preheating box 20 is provided with a ball float valve 16, the right side of the ball float valve 16 is connected with a water inlet valve 17, the middle part of the right side of the preheating box 20 is provided with a third temperature sensor 18, a hot water heating pipe 19 is arranged inside the preheating box 20, the bottom of the preheating box 20 is provided with a first blow-off valve 21, the box body of the preheating box 20 is made of 304 stainless steel, and the first blow-off valve 21 is made of a tetrafluoro gasket. The third temperature sensor 18 is made of 304 stainless steel. The hot water heating pipe 19 adopts 321 stainless steel shell of electric heating mode. The preheating box 20 adopts RO reverse osmosis purified water with the conductivity less than or equal to 10 mu S/cm.

In at least one embodiment, the blower 3 is installed on the left side of the air supply box 6, the heat exchanger 4 is installed on the left side inside the air supply box 6, the second temperature sensor 10 is installed near the left side at the bottom of the air supply box 6, the steam spray pipe 5 is installed in the middle of the bottom of the air supply box 6, the first humidity sensor 13 is installed near the right side at the bottom of the air supply box 6, and the flow equalizing plate 14 is installed on the right side of the air supply box 6.

The scheme is refined, the whole air supply box 6 is made of a 304 stainless steel plate through bending, the fan 3 is a centrifugal fan, the air volume is 4100-5400 m3/h, and the air pressure is 1200 Pa. The flow equalizing plate 14 is made of 304 stainless steel woven mesh or orifice plate structure, which has the function of reducing turbulence, and the air flow sent out of the flow equalizing plate 14 can be directly used for process equipment or can be conveyed to a use place through a pipeline. The heat exchanger 4 adopts an air-cooling or water-cooling air-conditioning module and has two modes of refrigeration and heating.

In at least one embodiment, the steam nozzle 5 includes a nozzle housing 27, the left side of the nozzle housing 27 is a steam inlet, and is connected to the steam box 25 through the steam hose 11, the left side of the bottom of the nozzle housing 27 is provided with a condensation return port 28, a steam guide plate 29 is arranged inside the nozzle housing 27, the upper portion of the nozzle housing 27 is uniformly provided with steam nozzles 30, the upper portion of the steam guide plate 29 is a steam cavity 32, and the lower portion of the steam guide plate is a condensation return cavity 31.

The scheme refines, spray tube casing 27, 321 stainless steel are chooseed for use to steam guide plate 29, steam guide plate 29 welds inside spray tube casing 27, thereby keep apart and form upper portion steam chamber 32 and lower part condensation backward flow chamber 31, steam guide plate 29 right-hand member is 3mm for spray tube casing 27's horizontal axis squint downwards, it is convenient for the comdenstion water entering condensation backward flow chamber 31 to discharge from condensation backward flow mouth 28 to form the slope, condensation backward flow mouth 28 passes through condensing hose 12 and is connected with preheating cabinet 20, recycle carries out.

In at least one embodiment, the thermal balance valve 23 includes a valve body 39, a valve core 37 is disposed in the valve body 39, a high temperature chamber 38 is disposed on the left side of the valve core 37, a low temperature chamber 36 is disposed on the right side of the valve core 37, the valve core 37 is connected to a heat-sensitive push rod 34 through an adjusting rod 33, and a heat-sensitive element 35 is mounted at the rear of the heat-sensitive push rod.

The scheme is refined, the high-temperature cavity 38 is connected with the steam box 25, and the low-temperature cavity 36 is connected with the preheating box 20. The valve body 39 and the valve core 37 are made of stainless steel or brass.

The thermal balance valve 23 is used for balancing the temperature difference between the two sides of the valve body 39, the thermosensitive element 35 drives the thermosensitive push rod 34 to extend when detecting that the temperature of the low-temperature cavity 36 reaches the set temperature, the adjusting rod 33 moves along with the thermosensitive push rod to push the valve core 37 to open, water in the preheating tank 20 is continuously supplemented to the steam box 25, and when the thermosensitive element 35 detects that the temperature of the low-temperature cavity 36 is low, the valve core 37 is driven to close, low-temperature water is prevented from flowing into the steam box 25, so that the phenomenon that the boiling of hot water is stopped to stop steam is avoided, and the action process is continuously and circularly carried out. The thermosensitive element 35 is one of bimetal, swelling solid and swelling liquid. The fixed angle between the adjusting rod 33 and the heat-sensitive push rod 34 can be adjusted to set the heat balance temperature between 85 ℃ and 99.9 ℃, and the steam in the preheating box 20 is more stable as the temperature is closer to the boiling point steam box 25 without considering the energy consumption.

In at least one embodiment, the base 1 is provided with the control cabinet 2, the control cabinet 2 is connected with the liquid level sensor 7, the first temperature sensor 8, the pressure sensor 9, the second temperature sensor 10, the humidity sensor 13 and the third temperature sensor 18 through signal cables, the control cabinet 2 is connected with the hot water heating pipe 19, the steam heating pipe 26 and the fan 3 through control cables, the control cabinet 2 is provided with a display screen, an operation button, a program controller, a power regulator and a frequency converter, and the control cabinet 2 has the functions of displaying, controlling and data storing.

The working principle and the using process of the utility model are as follows:

the pipeline purified water is added into the preheating tank 20 through the water inlet valve 17 and the ball float valve 16, when the liquid level rises to the upper limit, the ball float valve 16 closes the water inlet due to buoyancy, and the water inlet valve 17 is kept in a normally open state. The control cabinet 2 is started, the hot water heating pipe 19 is electrified to be heated, the constant state is kept after the set preheating temperature reaches 96 ℃, when the temperature reaches the set temperature (85-99.9 ℃) of the thermal balance valve 23, hot water in the preheating box 20 enters the steam box 25 through the thermal balance valve 23, the liquid level of the preheating box 20 is reduced, the ball float valve 16 is opened to continuously supplement water, and the hot water heating pipe 19 is continuously heated. When the liquid level sensor 7 detects the upper limit of the liquid level of the steam box 25, the steam heating pipe 26 is electrified and heated until water boils, steam starts to be generated, and the pressure sensor 9 has the functions of steam pressure detection and overpressure protection.

Further explanation of the function of the thermal balance valve 23 is that when the water temperature in the preheating tank 20 does not reach the opening temperature set by the thermal balance valve 23, the thermal balance valve 23 is closed, water supply into the steam tank 25 is stopped, sufficient capacity is set in the steam tank 25 to ensure continuous steam generation, when the water temperature in the preheating tank 20 reaches a set value, the thermal balance valve 23 is opened, the water level in the steam tank 25 is continuously supplied to the upper limit, and the process is continuously and circularly performed.

Meanwhile, steam enters the air supply box 6 through the steam hose, the fan 3 is started, outdoor air is extracted, is subjected to constant temperature through the heat exchanger 4, is humidified and mixed through the steam spray pipe 5, and then is sent to a use point through the flow equalizing plate 14. In the process, the humidity sensor 13 detects the air supply humidity in real time, a signal is transmitted to the control cabinet 2, the control cabinet 2 dynamically controls the output power of the steam heating pipe 26 according to the set required humidity of 30% RH by adopting a negative feedback control principle, so that the air supply humidity is stabilized at the required value, and the humidity can be controlled at 30% +/-1.0% RH. Meanwhile, the temperature sensor 10 detects the air supply temperature in real time, signals are transmitted to the control cabinet 2, the control cabinet 2 dynamically controls the heat exchanger 4 according to the set required temperature of 25 ℃, so that the air supply temperature is stabilized at the required value, and the temperature can be controlled at 25 +/-0.5 ℃.

The function of the heat exchanger 4 is further explained, when the outdoor air temperature is high, the heat exchanger 4 is switched to a refrigeration mode, and the air is cooled and dehumidified. When the outdoor air temperature is low, the heat exchanger 4 is switched to a heating mode to heat the air, so that the air supply temperature is stabilized at a required value.

Finally, the air index output by the air supply box 6 can realize the adjustment of the humidity between 10 percent RH and 80 percent, the precision of the humidity is +/-1.0 percent RH, the temperature can be adjusted between 15 ℃ and 30 ℃, and the precision of the temperature is +/-0.5 ℃, thereby realizing the industrial air constant temperature and humidity device.

Example 2

The industrial air constant temperature and humidity device in example 2 is different from that in example 1 in that: the air power source is different.

In the embodiment 1, the fan 3 of the air supply box 6 is a centrifugal fan, and the temperature and humidity of the extracted outdoor air change with the climate, especially in two seasons of winter and summer, so that the difficulty of the later constant temperature and humidity treatment is increased. The embodiment aims at the situation, the compressed air of the pipeline commonly used in the industrial field is used as an air power source, the compressed air is generated by a special compressor device, the temperature and the humidity are basically stable, the environmental influence can be reduced to the minimum, and the stability is further improved.

In the specific embodiment, as shown in fig. 6, the air source connector 40 is connected with the pressure regulating valve 41 through a pipeline, the pressure regulating valve 41 is connected with the flow regulating valve 42 through a pipeline, the flow regulating valve 42 is connected with the diffusion cavity 43 through a pipeline, the diffusion cavity 43 is connected with the left side of the box body of the air supply box 6 through a flange, and the pipeline is made of 304 stainless steel to ensure clean air.

In the working process of the embodiment, steam is generated in the same manner as in embodiment 1, the steam enters the air supply box 6 through the steam hose 11, meanwhile, compressed air is connected through the air source connector 40, the pressure is regulated to 1200Pa through the pressure regulating valve 41, the flow regulating valve 42 is regulated to 5000m3/h, the air after pressure stabilization enters the air supply box 6 through the diffusion cavity 43 at a constant speed, and the air after temperature stabilization is kept by the heat exchanger 4, is humidified and mixed by the steam nozzle 5 and is then sent to a use point through the flow equalizing plate 14. In the process, the humidity sensor 13 detects the air supply humidity in real time, signals are transmitted to the control cabinet 2, the control cabinet 2 dynamically controls the output power of the steam heating pipe 26 according to the set required humidity of 40% RH by adopting a negative feedback control principle, so that the air supply humidity is stabilized at the required value, and the humidity can be controlled at 40% +/-0.5% RH. Meanwhile, the temperature sensor 10 detects the air supply temperature in real time, signals are transmitted to the control cabinet 2, the control cabinet 2 dynamically controls the heat exchanger 4 according to the set required temperature of 25 ℃, so that the air supply temperature is stabilized at the required value, and the temperature can be controlled at 25 +/-0.2 ℃.

Finally, the air index output by the air supply box 6 can realize the adjustment of the humidity between 10 percent RH and 80 percent, the precision of the humidity +/-0.5 percent RH, the temperature between 15 ℃ and 30 ℃ and the precision of the temperature +/-0.2 ℃, and the constant temperature and humidity stability is further improved compared with that of the embodiment 1.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides an industrial air constant temperature and humidity device, its characterized in that, includes the base, fixedly connected with preheating cabinet and steam chest on the base, the preheating cabinet passes through the heat balance valve and connects the steam chest, and the steam chest passes through the steam hose and is connected with the supply-air box, and the supply-air box passes through the condensation hose and is connected with the preheating cabinet, and the whole cladding heat preservation in preheating cabinet, steam chest, supply-air box surface.

2. The industrial air constant temperature and humidity device as claimed in claim 1, wherein the upper part of the steam box is provided with a pressure sensor, the left side of the steam box is provided with a liquid level sensor and a first temperature sensor, the steam box is internally provided with a steam heating pipe, and the bottom of the steam box is provided with a second blowoff valve.

3. The industrial air constant temperature and humidity device according to claim 1, wherein an exhaust valve is installed on the upper portion of the preheating tank, a ball float valve is installed on the right side of the preheating tank, a water inlet valve is connected to the right side of the ball float valve, a third temperature sensor is installed in the middle of the right side of the preheating tank, a hot water heating pipe is installed inside the preheating tank, and a first sewage discharge valve is installed at the bottom of the preheating tank.

4. The industrial air constant temperature and humidity device as claimed in claim 1, wherein a fan is installed on the left side of the air supply box, a heat exchanger is installed on the left side inside the air supply box, a second temperature sensor is installed near the left side of the bottom of the air supply box, a steam nozzle is installed in the middle of the bottom of the air supply box, a first humidity sensor is installed near the right side of the bottom of the air supply box, and a flow equalizing plate is installed on the right side of the air supply box.

5. The industrial air constant temperature and humidity device as claimed in claim 4, wherein the air box is made of stainless steel plate by bending, and the flow equalizing plate is a stainless steel mesh grid or a rectangular plate with through holes.

6. The industrial air constant temperature and humidity device according to claim 4, wherein the steam spraying pipe comprises a spraying pipe shell, the left side of the spraying pipe shell is provided with a steam inlet and is connected with a steam box through a steam hose, the bottom of the spraying pipe shell is provided with a condensation reflux opening towards the left, the inside of the spraying pipe shell is provided with a steam guide plate, the upper part of the spraying pipe shell is uniformly provided with steam nozzles, the upper part of the steam guide plate is a steam cavity, and the lower part of the steam guide plate is a condensation reflux cavity.

7. The industrial air constant temperature and humidity device as claimed in claim 6, wherein the steam guide plate is welded inside the spray pipe shell to separate the spray pipe shell into an upper steam cavity and a lower condensation reflux cavity, the right end of the steam guide plate is downwardly deviated by 3mm relative to the horizontal axis of the spray pipe shell, and the condensation reflux port is connected with the preheating tank through a condensation hose.

8. The industrial air constant temperature and humidity device as claimed in claim 1, wherein the heat balance valve comprises a valve body, a valve core is arranged in the valve body, the left side of the valve core is a high temperature cavity, the right side of the valve core is a low temperature cavity, the valve core is connected with a heat sensitive push rod through an adjusting rod, a heat sensitive element is arranged at the rear part of the heat sensitive push rod, the high temperature cavity is connected with a steam box, and the low temperature cavity is connected with a preheating box.

9. The industrial air constant temperature and humidity device according to claim 1, wherein the base is provided with a control cabinet, the control cabinet is connected with the liquid level sensor, the first temperature sensor, the pressure sensor, the second temperature sensor, the humidity sensor and the third temperature sensor through signal cables, the control cabinet is connected with the hot water heating pipe, the steam heating pipe and the fan through control cables, and the control cabinet is provided with a display screen, an operation button, a program controller, a power regulator and a frequency converter.

10. The industrial air constant temperature and humidity device as claimed in claim 1, further comprising an air source connector, wherein the air source connector is connected with a pressure regulating valve through a pipeline, the pressure regulating valve is connected with a flow regulating valve through a pipeline, the flow regulating valve is connected with a diffusion cavity through a pipeline, and the diffusion cavity is connected with the left side of the box body of the air supply box through a flange.