Anti-condensation and anti-icing exhaust duct

Abstract

The utility model provides an anti-condensation and anti-icing exhaust air pipe which comprises an indoor air pipe and an outdoor air pipe. The air exhaust direction is from the front end to the tail end, the cross section of the indoor air pipe is gradually reduced in the air exhaust direction, and the front end of the indoor air pipe is located indoors and connected with an air exhaust fan; the tail end of the indoor air pipe extends outdoors; the outdoor air pipe and the indoor air pipe are coaxially arranged; the outdoor air pipe comprises an outdoor air pipe body with the equal cross section, an outwards-turned horn-mouth-shaped turned edge is further formed at the front end of the outdoor air pipe body, the tail end of the indoor air pipe is sleeved with the outwards-turned horn-mouth-shaped turned edge, a gap is formed between the outwards-turned horn-mouth-shaped turned edge and the outer wall of the tail end of the indoor air pipe, and an outdoor induced air flow channel is formed. The utility model provides a novel air exhaust duct structure, which effectively prevents the phenomena of air exhaust condensation and freezing through special design, ensures the normal operation of an air exhaust system, reduces the risk of ground freezing, and ensures that the air exhaust system can safely and efficiently operate in winter.

Description

Technical Field

[0001] The utility model relates to an exhaust air duct, in particular to an exhaust air duct for preventing condensation and icing. Background Art

[0002] At present, when a pumped-storage power station operates in winter, fresh air enters the underground powerhouse through a ventilation tunnel. The hot air in the underground powerhouse enters the exhaust fan room through an exhaust air shaft, and then under the action of the fan in the exhaust fan room, it is discharged to the outside through the air duct.

[0003] During the exhaust process of the fan, the following problems mainly exist: (1) Since the hot air is in direct contact with the inner wall of the air duct, the temperature of the air duct wall is relatively high, and a hot air flow is formed around the outside of the air duct wall. When it is in direct contact with the cold air outside, it is easy to condense. The condensed water droplets will fall to the ground, resulting in icing on the ground, increasing the risk of personnel slipping and traffic hazards. (2) When the hot air passes through the air duct, it releases heat and freezes on the air duct wall, resulting in icing inside the air duct, which not only reduces the exhaust efficiency of the air duct, but also may cause the air duct to be blocked, increasing the maintenance cost and potential safety hazards. Content of the Utility Model

[0004] In view of the defects existing in the prior art, the utility model provides an exhaust air duct for preventing condensation and icing, which can effectively solve the above problems.

[0005] The technical solution adopted by the utility model is as follows:

[0006] The utility model provides an exhaust air duct for preventing condensation and icing, including an indoor air duct (1) and an outdoor air duct (2);

[0007] Taking the exhaust air direction from the front end to the end, along the exhaust air direction, the cross-section of the indoor air duct (1) gradually shrinks. The front end of the indoor air duct (1) is located indoors and is connected to an exhaust fan (3); the end of the indoor air duct (1) extends outdoors.

[0008] The outdoor air duct (2) is arranged coaxially with the indoor air duct (1); the outdoor air duct (2) includes an outdoor air duct main body (2-1) with an equal cross-section. The diameter R1 of the outdoor air duct main body (2-1) is larger than the end diameter R2 of the indoor air duct (1). Moreover, the front end of the outdoor air duct main body (2-1) is located behind the end of the indoor air duct (1), so that there is a dislocation interval between the front end of the outdoor air duct main body (2-1) and the end of the indoor air duct (1); an outwardly turned flared flange (2-2) is formed at the front end of the outdoor air duct main body (2-1), which is sleeved outside the end of the indoor air duct (1) and has an interval with the outer wall of the end of the indoor air duct (1), forming an outdoor air guiding channel (4).

[0009] Preferably, the outdoor air intake channel (4) is an arc-shaped channel, and its cross-section gradually decreases along the air intake direction.

[0010] Preferably, the front end cross-sectional diameter of the indoor air duct (1) is 1.2 m, the end cross-sectional diameter is 0.8 m, and the length is 1.5 m; the cross-sectional diameter of the outdoor air duct main body (2-1) of the outdoor air duct (2) is 1.2 m, and the length is 2.5 m; the outward turning angle of the outward turning flared flange (2-2) is 135°, and the arc length is 0.6 m.

[0011] The exhaust air duct for preventing condensation and icing provided by the present invention has the following advantages:

[0012] The present invention provides a new exhaust air duct structure, which can effectively prevent the phenomenon of exhaust air condensation and icing through special design, ensure the normal operation of the exhaust air system, reduce the risk of ground icing, and ensure the safe and efficient operation of the exhaust air system in winter. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic side exhaust air layout diagram of the exhaust air duct for preventing condensation and icing provided by the present invention;

[0014] Figure 2 It is a schematic top exhaust air layout diagram of the exhaust air duct for preventing condensation and icing provided by the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0015] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0016] The present invention provides an exhaust air duct structure for preventing condensation and icing, which can effectively prevent the phenomenon of exhaust air condensation and icing through special design, ensure the normal operation of the exhaust air system, reduce the risk of ground icing, and ensure the safe and efficient operation of the exhaust air system in winter.

[0017] The present invention provides an exhaust air duct structure for preventing condensation and icing, and the structure is as follows:

[0018] 1. Design a group of air ducts, including an indoor air duct 1 and an outdoor air duct 2; wherein, the front end of the indoor air duct 1 is connected to an exhaust fan 3, and the cross-section of the indoor air duct 1 gradually decreases from the front end to the end.

[0019] 2. The end of the indoor air duct 1 extends to the outside; the front end of the outdoor air duct 2 has an outward turning flared flange 2-2, which is sleeved on the end of the indoor air duct 1, and there is a certain space in the middle to form an outdoor air intake channel 4.

[0020] 3. The end of the outdoor air duct 2 is extended so that the outdoor air duct 2 can introduce cold air from the outdoor air flow channel 4 at the bell mouth, the hot air flows in the middle of the outdoor air duct 2, and the cold air flows near the pipe wall of the outdoor air duct around the pipe.

[0021] 4. Through the above structure, the condensation position is located inside the outdoor air duct 2, and the condensed water droplets are blown away by the flowing cold air, avoiding the phenomenon of ice formation on the duct wall surface and the road.

[0022] Specifically, referring to Figures 1 to 2 , the utility model provides an exhaust air duct for preventing condensation and icing, which can be horizontally arranged or vertically arranged, and includes an indoor air duct 1 and an outdoor air duct 2;

[0023] Taking the direction from the front end to the end as the exhaust air direction, along the exhaust air direction, the cross-section of the indoor air duct 1 gradually decreases, the front end of the indoor air duct 1 is located indoors and is connected to the exhaust air fan 3; the end of the indoor air duct 1 extends outdoors;

[0024] The outdoor air duct 2 and the indoor air duct 1 are coaxially arranged; the outdoor air duct 2 includes an outdoor air duct main body 2-1 with an equal cross-section, the diameter R1 of the outdoor air duct main body 2-1 is larger than the end diameter R2 of the indoor air duct 1, and the front end of the outdoor air duct main body 2-1 is located behind the end of the indoor air duct 1, so that there is a dislocation interval between the front end of the outdoor air duct main body 2-1 and the end of the indoor air duct 1; an outward-turning flared flange 2-2 is further formed at the front end of the outdoor air duct main body 2-1, which is sleeved outside the end of the indoor air duct 1 and has an interval with the outer wall of the end of the indoor air duct 1 to form an outdoor air flow channel 4. The outdoor air flow channel 4 is an arc-shaped flow channel, and its cross-section gradually decreases along the air intake direction.

[0025] As a specific structural parameter, the cross-sectional diameter of the front end of the indoor air duct 1 is 1.2m, the cross-sectional diameter of the end is 0.8m, and the length is 1.5m; the cross-sectional diameter of the outdoor air duct main body 2-1 of the outdoor air duct 2 is 1.2m, and the length is 2.5m; the outward-turning angle of the outward-turning flared flange 2-2 is 135°, and the arc length is 0.6m.

[0026] The utility model provides a structure of an exhaust air duct for preventing condensation and icing, and the design features are as follows:

[0027] 1. Design of the inwardly tapered indoor air duct: The design of the gradually decreasing cross-section of the indoor air duct 1 ensures the smooth discharge of hot air and the smooth introduction of outdoor cold air.

[0028] 2. Flared design: The flared design at the front end of the outdoor air duct 2 is used to introduce cold air, so that cold air and hot air form a cold and hot air layer structure in which cold air surrounds hot air inside the outdoor air duct 2.

[0029] 3. Inner and outer pipe design: The outdoor air duct 2 is sleeved at the end of the indoor air duct 1, and there is a space between the two, so that cold air and hot air can flow reasonably inside the air duct, preventing icing.

[0030] 4. Air duct structure optimization: Through the optimized design of the air duct length and structure, cold and hot air flow inside the air duct, making the condensation position inside the outdoor air duct 2 and away from the wall surface, effectively preventing the condensed dew water droplets from condensing into ice on the ground and the air duct wall surface. At the same time, the introduction of cold air can blow away the condensed water droplets, preventing icing.

[0031] The specific exhaust process is as follows:

[0032] The cross-section of the indoor air duct 1 gradually shrinks, so that the hot air flows inside the indoor air duct 1 and is discharged smoothly, and is discharged into the inside of the outdoor air duct 2;

[0033] The outdoor cold air is introduced into the inside of the outdoor air duct 2 through the action of the outdoor air intake channel 4, and through the shape design of the flanged edge 2-2 of the flared shape, the outdoor cold air flows along the inner wall of the outdoor air duct 2;

[0034] For the hot air discharged from the indoor air duct 1 and discharged into the outdoor air duct 2, on the one hand, because the diameter of the end of the indoor air duct 1 is smaller than the diameter of the outdoor air duct 2, and under the flow restriction of the outdoor cold air flowing along the inner wall of the outdoor air duct 2, the hot air flows in the middle area of the outdoor air duct 2; thus, a double-layer structure with cold air on the outer layer and hot air on the inner layer is formed inside the outdoor air duct 2, forming a cold and hot air layer structure in which cold air surrounds hot air.

[0035] This kind of cold and hot air layer structure in which cold air surrounds hot air has the following advantages:

[0036] (1) Since the cold air flows along the pipe wall of the outdoor air duct 2, therefore, the temperature difference between the inside and outside of the pipe wall of the outdoor air duct 2 is reduced, and the problems of condensation caused by the direct contact between the hot air flow and the outdoor cold air, and the freezing of the condensed dew water droplets falling to the ground are solved;

[0037] (2) Since the cold air directly contacts the pipe wall of the outdoor air duct 2, therefore, the problem of the hot air freezing on the pipe wall of the air duct and causing the inside of the air duct to freeze is solved.

[0038] In the exhaust system of the main powerhouse of a pumped-storage power station, the exhaust air duct structure of the present utility model is adopted. The basic working process is as follows:

[0039] Install the exhaust fan 3 and connect the indoor air duct 1, ensuring that the front end of the indoor air duct 1 is tightly connected to the exhaust fan 3. The cross-section of the indoor air duct 1 gradually narrows from the fan end to the end.

[0040] Extend the end of the indoor air duct 1 outdoors and connect it to the outdoor air duct 2, ensuring that the flared part of the outdoor air duct 2 is sleeved on the end of the indoor air duct 1.

[0041] Extend the outdoor air duct 2 so that cold air is introduced from the flared opening to surround the hot air, forming a hot and cold air layer structure where cold air surrounds hot air.

[0042] During the operation of the exhaust system, the hot air is discharged through the indoor air duct 1 and enters the outdoor air duct 2. The cold air surrounds the flowing hot air, and the condensed water droplets are carried away by the cold air.

[0043] After a period of operation and observation, this system effectively reduces the phenomenon of ground icing, and the condensation phenomenon on the wall surface of the exhaust duct has also been significantly controlled, ensuring the normal operation of the exhaust system.

[0044] Through the above design, the anti-condensation and anti-icing exhaust air duct of the present utility model has the following advantages:

[0045] 1. Prevent ground icing: It avoids the condensation after the direct contact between hot air and cold air, and prevents the condensed water droplets from falling to the ground and causing ground icing.

[0046] 2. Prevent duct icing: By introducing cold air and the reasonable design of the duct, the icing problem inside the duct is prevented, ensuring the smooth and efficient operation of the exhaust system.

[0047] 3. Improve safety and reliability: It effectively solves the problem of icing in the winter exhaust system, and improves the safety and reliability of the exhaust system during winter operation.

[0048] The above is only the preferred embodiment of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present utility model, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the present utility model.

Claims

1. An exhaust air duct for preventing condensation and icing, characterized in that, It includes an indoor air duct (1) and an outdoor air duct (2); Taking the direction from the front end to the end as the exhaust direction, along the exhaust direction, the cross-section of the indoor air duct (1) gradually shrinks. The front end of the indoor air duct (1) is located indoors and is connected to an exhaust fan (3); the end of the indoor air duct (1) extends outdoors; The outdoor air duct (2) and the indoor air duct (1) are arranged coaxially; the outdoor air duct (2) includes an outdoor air duct main body (2-1) with an equal cross-section. The diameter R1 of the outdoor air duct main body (2-1) is larger than the end diameter R2 of the indoor air duct (1). Moreover, the front end of the outdoor air duct main body (2-1) is located at the rear side of the end of the indoor air duct (1), so that there is a dislocation interval between the front end of the outdoor air duct main body (2-1) and the end of the indoor air duct (1); an outwardly turned flared flange (2-2) is formed at the front end of the outdoor air duct main body (2-1), sleeved outside the end of the indoor air duct (1), and there is an interval between it and the outer wall of the end of the indoor air duct (1), forming an outdoor air guiding flow channel (4).

2. The anti-condensation and anti-icing exhaust air duct according to claim 1, wherein, The outdoor air guiding flow channel (4) is an arc-shaped flow channel, and its cross-section gradually decreases along the air guiding direction.

3. The exhaust air duct for preventing condensation and icing according to claim 1, characterized in that The cross-section diameter of the front end of the indoor air duct (1) is 1.2 m, the cross-section diameter of the end is 0.8 m, and the length is 1.5 m; the cross-section diameter of the outdoor air duct main body (2-1) of the outdoor air duct (2) is 1.2 m, and the length is 2.5 m; the outward turning angle of the outwardly turned flared flange (2-2) is 135°, and the arc length is 0.6 m.

Images