Underground air duct opening dew point temperature control system

Abstract

The invention relates to the technical field of underground air duct exhaust, in particular to an underground air duct opening dew point temperature control system. The underground air duct opening dew point temperature control system comprises a main exhaust duct, a temperature and humidity sensing structure and an air mixing structure. The air mixing structure comprises a plenum chamber and jet flow nozzles, the plenum chamber is annularly arranged on the wall surface of the inner side of an air duct opening of the main exhaust duct, the thickness of the plenum chamber is gradually reduced in the air flowing direction, and the jet flow nozzles are installed on the plenum chamber; the temperature and humidity sensing structure comprises a plurality of temperature and humidity sensors and temperature sensors, the temperature and humidity sensors are arranged on the inner side of an air duct opening of the main exhaust duct, and the temperature sensors are arranged outside the main exhaust duct. The dew-point temperature control system for the opening of the underground air duct can prevent water vapor in hot and humid air exhausted from the air duct from being condensed into white smoke in an external low-temperature environment, and completely eradicates the influence of the white smoke on the external environment and the exposure of the position of the air outlet.

Description

Technical Field

[0001] The present invention relates to the technical field of underground air duct exhaust, and particularly to a dew point temperature control system for the mouth part of an underground air duct. Background Art

[0002] China has a vast territory, rich and complex geological types. Therefore, underground engineering occupies an important position in the field of engineering construction in China and is widely used in fields such as railways, water conservancy, mining, military, highways, subways, undersea tunnels, and residences.

[0003] At present, underground engineering generally has a need for exhaust and ventilation. The temperature and humidity of the exhaust air in the underground air duct are usually relatively stable. When discharged to the external low-temperature environment in winter, the "white smoke" phenomenon is likely to occur. The reason is that the dew point temperature of the exhaust air is higher than the external environment temperature, and the water vapor in the exhaust air is easily condensed into fine water droplets, which cannot achieve the purpose of concealed discharge for special projects. Summary of the Invention

[0004] The purpose of the present invention is to provide a dew point temperature control system for the mouth part of an underground air duct, which can prevent the water vapor in the hot and humid air discharged from the air duct from condensing into "white smoke" in the external low-temperature environment, eliminate the impact of the "white smoke" on the external environment, and expose the position of the air outlet.

[0005] The present invention provides a dew point temperature control system for the mouth part of an underground air duct, including: a main exhaust air duct, a temperature and humidity sensing structure, and a mixing air structure;

[0006] The mixing air structure includes a static pressure box and jet nozzles. The static pressure box is annularly arranged on the inner wall surface of the air outlet of the main exhaust air duct, and the thickness of the static pressure box gradually becomes thinner along the air flow direction. A plurality of the jet nozzles are installed on the static pressure box;

[0007] The temperature and humidity sensing structure includes a temperature and humidity sensor and a temperature sensor. A plurality of the temperature and humidity sensors are arranged inside the air outlet of the main exhaust air duct, and the temperature sensor is arranged outside the main exhaust air duct.

[0008] Preferably, the jet nozzles are air volume adjustable jet nozzles;

[0009] The jet nozzles are staggered and installed on the static pressure boxes on both sides, and the jet nozzles are centrally installed on the top static pressure box and the ground static pressure box.

[0010] Preferably, it further includes a heat preservation air duct;

[0011] The heat preservation air duct is buried in the ground, and one end of the heat preservation air duct is arranged outside the air outlet.

[0012] Further preferably, a blower is further included, and the blower is installed inside the heat-insulating air duct, and the blower is located at one end of the heat-insulating air duct close to the static pressure box.

[0013] Preferably, three temperature and humidity sensors are provided, and the three temperature and humidity sensors are all arranged inside the air duct opening. One temperature and humidity sensor is arranged close to the top of the air duct opening, and the other two temperature and humidity sensors are arranged close to the bottom of the air duct opening.

[0014] Further preferably, a control cabinet is further included, and the control cabinet is arranged inside the main exhaust duct;

[0015] The control cabinet is electrically connected to the temperature and humidity sensor, the temperature sensor and the blower.

[0016] Further preferably, a data line is further included, and the control cabinet is connected to the temperature and humidity sensor, the temperature sensor and the blower through the data line.

[0017] Further preferably, the blower is a DC variable-speed EC blower.

[0018] Further preferably, the distance between the temperature and humidity sensor and the air duct opening is 0.3 m.

[0019] Preferably, the distance between the static pressure box and the air duct opening is 2 m.

[0020] Advantageous effects:

[0021] The technical solution of the present invention is to set a static pressure box on the inner wall surface of the air duct opening of the main exhaust duct, and then set a plurality of jet nozzles on the static pressure box, directly introduce the dry and cold air outside the main exhaust duct into the static pressure box and jet it onto the duct interface through the jet nozzles, mix and disturb the hot and humid air discharged from the underground air duct, and the air parameters of the exhaust air are sensed in real time by the temperature and humidity sensors arranged on the inner side of the air duct opening of the main exhaust duct, and the external environment temperature is sensed in real time by the temperature sensor, so as to prevent the water vapor in the hot and humid air discharged from the air duct from condensing into "white smoke" in the external low-temperature environment, eliminate the influence of "white smoke" on the external environment, and expose the position of the exhaust port. Description of the drawings

[0022] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0023] Figure 1It is a top-down sectional view of the dew point temperature control system at the underground air duct opening in the present invention;

[0024] Figure 2 It is a sectional view taken along line A-A in the present invention;

[0025] Figure 3 It is a sectional view taken along line B-B in the present invention.

[0026] Explanation of reference numerals:

[0027] 1: Main exhaust duct; 2: Insulated air duct; 3: Static pressure box; 4: Fan; 5: Jet nozzle; 6: Control cabinet; 7: Temperature and humidity sensor; 8: Temperature sensor; 9: Data cable. Detailed implementation manners

[0028] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0029] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0030] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless otherwise specifically defined. In addition, the terms "mounted", "connected", and "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] Such as Figures 1 to 3As shown in the figure, the present invention provides an underground air duct outlet dew point temperature control system, which includes a main exhaust duct 1, a temperature and humidity sensing structure, and a mixing air structure. The mixing air structure includes a static pressure box 3 and a jet nozzle 5. The static pressure box 3 is annularly arranged on the inner wall surface of the air duct outlet of the main exhaust duct 1. The thickness of the static pressure box 3 gradually thins along the air flow direction. A plurality of jet nozzles 5 are installed on the static pressure box 3. The temperature and humidity sensing structure includes a temperature and humidity sensor 7 and a temperature sensor 8. A plurality of temperature and humidity sensors 7 are arranged on the inner side of the air duct outlet of the main exhaust duct 1, and the temperature sensor 8 is arranged outside the main exhaust duct 1.

[0032] The technical solution of the present invention is to set a static pressure box 3 on the inner wall surface of the air duct outlet of the main exhaust duct 1, and then set a plurality of jet nozzles 5 on the static pressure box 3. The dry and cold air outside the main exhaust duct is directly introduced into the static pressure box 3 and jetted onto the air duct interface through the jet nozzles 5 to mix and disturb the hot and humid air discharged from the underground air duct. The air parameters of the exhaust air are sensed in real time by the temperature and humidity sensors 7 arranged on the inner side of the air duct outlet of the main exhaust duct 1, and the external environment temperature is sensed in real time by the temperature sensor 8, so as to prevent the water vapor in the hot and humid air discharged from the air duct from condensing into "white smoke" in the external low-temperature environment, eliminate the influence of "white smoke" on the external environment, and expose the position of the exhaust outlet.

[0033] Specifically, in this embodiment, the CFD technology is used to simulate the pressure distribution in the static pressure box 3, the number of jet nozzles 5, the air outlet speed, the installation position of the jet nozzles 5 on the static pressure box 3, and the directly introduced external air flow rate to ensure that the dry and cold air jetted out can completely eliminate the "white smoke" at the exhaust outlet.

[0034] The static pressure box 3 is a variable cross-section annular static pressure box 3. The distance between the static pressure box 3 and the air duct outlet is 2m, the width remains unchanged, and the thickness gradually thins along the air flow direction. It is assembled in a two-section type above and below the ground, and the cross-section is a gradual change type to ensure the static pressure balance in each section of the static pressure box 3 and the jet air speed is close.

[0035] The jet nozzle 5 is a variable air volume type jet nozzle. The jet nozzles 5 are staggered on the two side static pressure boxes 3, and the jet nozzles 5 are centrally installed on the top static pressure box 3 and the ground static pressure box 3. Specifically, in this embodiment, as Figure 3 shown, a total of 9 jet nozzles 5 are provided. Among them, 1 is arranged on the top static pressure box 3, 2 are arranged on the bottom static pressure box 3, 3 are arranged on one side static pressure box 3, and 3 are arranged on the other side static pressure box 3. As Figure 2 shown, the width of the static pressure box 3 is L. The distance between the 3 jet nozzles 5 arranged on one side static pressure box 3 and the end of the static pressure box 3 close to the air duct outlet is L, and the distance between the 3 jet nozzles 5 arranged on the other side static pressure box 3 and the end of the static pressure box 3 close to the air duct outlet is L. The distances between the jet nozzles 5 provided on the top static pressure chamber 3 and the bottom static pressure chamber 3 and the end of the static pressure chamber 3 close to the air duct opening are both L.

[0036] The dew point temperature control system for the underground air duct opening further includes a heat-insulating air duct 2, which is buried in the ground. One end of the heat-insulating air duct 2 is arranged outside the air duct opening, far from the air duct opening, and can prevent the air at the opening from being sucked in again. The dew point temperature control system for the underground air duct opening further includes a fan 4. Specifically, in this embodiment, the fan 4 is a DC variable-speed EC fan. As Figure 1 shown, the fan 4 is installed inside the heat-insulating air duct 2, specifically at one end of the heat-insulating air duct 2 close to the static pressure chamber 3. That is, the fan 4 directly sucks in external air through the buried heat-insulating air duct 2 and sprays it out through the jet nozzle 5.

[0037] There are 3 temperature and humidity sensors 7, and all 3 temperature and humidity sensors 7 are arranged inside the air duct opening. One of the temperature and humidity sensors 7 is arranged close to the top of the air duct opening, and the other 2 temperature and humidity sensors 7 are arranged close to the bottom of the air duct opening. Specifically, in this embodiment, all 3 temperature and humidity sensors 7 are suspended to the designated positions by iron wires, and the ends of the iron wires are fixed on the concrete surface of the exhaust duct. The distance between the temperature and humidity sensor 7 and the air duct opening is 0.3 m. These 3 temperature and humidity sensors 7 are used to sense the air parameters of the exhaust air in real time, and the three temperature parameters are input into the PLC and then arithmetically averaged to calculate the air dew point temperature. The temperature sensor 8 is arranged outside the main exhaust duct 1 to sense the external environmental temperature in real time.

[0038] When the calculated exhaust air dew point temperature is higher than the external environmental temperature, the fan 4 increases the air volume until the exhaust air dew point temperature is lower than the external environmental temperature. When the exhaust air dew point temperature is lower than the external environmental temperature, the fan 4 runs at a low speed to achieve the best balance of maintaining the control wall temperature and energy-saving operation.

[0039] The dew point temperature control system for the underground air duct opening further includes a control cabinet 6, which is arranged in the main exhaust duct 1. The control cabinet 6 is electrically connected to the temperature and humidity sensor 7, the temperature sensor 8 and the fan 4. The dew point temperature control system for the underground air duct opening further includes a data line 9, and the control cabinet 6 is connected to the temperature and humidity sensor 7, the temperature sensor 8 and the fan 4 through the data line 9.

[0040] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An underground air duct outlet dew point temperature control system, characterized in that, Including: The main exhaust air duct, the temperature and humidity sensing structure, and the mixing air structure; The mixing air structure includes a static pressure box and jet nozzles. The static pressure box is annularly arranged on the inner wall surface of the air inlet of the main exhaust air duct. The thickness of the static pressure box gradually thins along the air flow direction. A plurality of the jet nozzles are installed on the static pressure box; The temperature and humidity sensing structure includes temperature and humidity sensors and a temperature sensor. A plurality of the temperature and humidity sensors are arranged inside the air inlet of the main exhaust air duct, and the temperature sensor is arranged outside the main exhaust air duct.

2. The underground air duct outlet dew point temperature control system according to claim 1, characterized in that, The jet nozzles are air volume adjustable jet nozzles; The jet nozzles are staggeredly installed on the static pressure boxes on both sides, and the jet nozzles are centrally installed on the top static pressure box and the ground static pressure box.

3. The dew point temperature control system for the underground air duct opening according to claim 1, wherein It also includes a heat preservation air duct; The heat preservation air duct is buried in the ground, and one end of the heat preservation air duct is arranged outside the air inlet.

4. The underground air duct opening dew point temperature control system according to claim 3, characterized in that, It also includes a fan, and the fan is installed inside the heat preservation air duct. The fan is located at one end of the heat preservation air duct close to the static pressure box.

5. The dew point temperature control system for the underground air duct opening according to claim 1, wherein There are 3 temperature and humidity sensors, and all 3 temperature and humidity sensors are arranged inside the air inlet. Among them, 1 temperature and humidity sensor is arranged close to the top of the air inlet, and the other 2 temperature and humidity sensors are arranged close to the bottom of the air inlet.

6. The dew point temperature control system for the underground air duct inlet according to claim 4, characterized in that, It also includes a control cabinet, and the control cabinet is arranged inside the main exhaust air duct; The control cabinet is electrically connected to the temperature and humidity sensors, the temperature sensor, and the fan.

7. The dew point temperature control system for the underground air duct opening according to claim 6, characterized in that, It also includes a data cable, and the control cabinet is connected to the temperature and humidity sensors, the temperature sensor, and the fan through the data cable.

8. The dew point temperature control system for the underground air duct opening according to claim 4, characterized in that, The fan is a DC variable speed EC fan.

9. The dew point temperature control system for the underground air duct opening according to claim 5, wherein The distance between the temperature and humidity sensor and the air inlet is 0.3m.

10. The dew point temperature control system for the underground air duct opening according to claim 1, wherein, The distance between the static pressure box and the air inlet is 2m.

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