Air duct for blowing-type cooling tower

Abstract

The utility model discloses an air duct for a blowing-type cooling tower, which comprises an air duct body made of stainless steel, a blowing component is mounted in the air duct body, and the air duct body is of a cylindrical structure formed by sequentially and fixedly connecting an air inlet section, a contraction section, a blowing section and a diffusion section. The air blowing assembly comprises a blade assembly rotationally installed on the air blowing section and a driving assembly fixedly installed on the inner wall of the contraction section and used for driving the blade assembly to rotate, the air duct body is provided with an air inlet and an air outlet, the air outlet is communicated with a cooling tower, and the air inlet section and the air blowing section are each of a straight tube structure. The contraction section and the diffusion section are both of a trumpet-shaped linear cylindrical structure, the diameter of the air inlet is larger than that of the air outlet, and the length of the contraction section is smaller than that of the diffusion section. The cooling tower is convenient to install and stable in structure, saves materials, reduces energy consumption and better conforms to the aerodynamic principle, the ventilation quantity of the cooling tower is obviously increased, and the thermal performance of the cooling tower is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of cooling towers, in particular to a wind tube for a blast type cooling tower. Background Art

[0002] The blast cooling tower is a mechanical ventilation cooling tower with many advantages such as corrosion resistance, easy maintenance and overhaul, stable tower structure, strong cooling effect, etc. It is widely used. The blast cooling tower has many applicable fields. It can be used in areas with high temperature and humidity, industries with high requirements for cooling water temperature and strict stability, places with limited area and narrow space, subway air-conditioning systems, etc.

[0003] The forced draft cooling tower uses the fan at the bottom of the cooling tower to force the strong cold air outside the tower into the tower through the air inlet duct under the tower, and the medium to be cooled is evenly sprayed into the tower by the tubular water distribution system, exchanging heat with the rising cold air entering the tower to achieve the cooling effect on the cooling medium.

[0004] The thermal performance of a mechanical ventilation cooling tower is closely related to the airflow characteristics in the tower. Uniform and smooth airflow conditions can maximize the heat exchange potential of hot water and cold air and improve the overall heat dissipation effect of the cooling tower. This places high demands on the design of the air inlet of the cooling tower. At present, the air duct structure of a blast-type cooling tower is relatively simple, mostly a simple straight-tube structure. Based on this, in order to improve the thermal performance of the cooling tower and reduce energy consumption, the inventor proposes a duct for a blast-type cooling tower. Utility Model Content

[0005] The technical problem to be solved by the utility model is: to overcome the defects of the existing technical problems and provide a fan for a blast cooling tower, which is easy to install, has a stable structure, saves materials, reduces energy consumption, is more in line with the principles of aerodynamics, significantly increases the ventilation volume of the cooling tower, and greatly improves the thermal performance of the cooling tower.

[0006] In order to solve the above technical problems, the technical solution of the utility model is: a wind duct for a blast-type cooling tower, comprising a wind duct body, the wind duct body is made of stainless steel, a blast assembly is installed in the wind duct body, the wind duct body is a cylindrical structure formed by an air inlet section, a contraction section, a blast section and a diffusion section fixedly connected in sequence, the blast assembly comprises a blade assembly rotatably mounted on the blast section and a drive assembly fixedly mounted on the inner wall of the contraction section for driving the blade assembly to rotate, the wind duct body has an air inlet and an air outlet, the air outlet is connected to the cooling tower, the air inlet section and the blast section are both straight-cylinder structures, the contraction section and the diffusion section are both trumpet-shaped linear cylindrical structures, the diameter of the air inlet is larger than the diameter of the air outlet, and the length of the contraction section is smaller than the length of the diffusion section.

[0007] Furthermore, the inner diameter of the contraction section gradually decreases from the air inlet section to the blast section, and the inner diameter of the diffusion section gradually increases from the blast section to the cooling tower. The ends with smaller inner diameters of the contraction section and the diffusion section are fixedly connected to both ends of the blast section respectively.

[0008] Furthermore, mounting angle plates are fixedly mounted on the outer walls of the air inlet section and the air blowing section, and the air duct body is fixedly connected to a mounting bracket fixedly mounted on the ground via the mounting angle plates.

[0009] Furthermore, the angle between the diffusion section and the axis of the wind tube body is a diffusion angle, the angle between the contraction section and the axis of the wind tube body is a contraction angle, and the angle of the diffusion angle is smaller than the angle of the contraction angle.

[0010] Furthermore, the driving assembly includes a motor and a reducer, and the central axis of the blade assembly is fixedly connected to the output shaft of the motor through the reducer.

[0011] Furthermore, a mounting plate is provided in the contraction section, the motor and the reducer are both fixedly mounted on the mounting plate, the mounting frame is fixedly connected below the mounting plate, and the mounting frame is fixedly mounted on the inner wall of the contraction section.

[0012] Furthermore, the upper surface of the reducer is arc-shaped.

[0013] Furthermore, the diameter of the blade assembly corresponds to the inner diameter of the blowing section.

[0014] By adopting the above technical solution, the utility model has the following beneficial effects:

[0015] 1. The material of the air duct body is stainless steel, which reduces the weight, reduces the pressure bearing capacity requirements of the mounting bracket, and makes the structure more stable;

[0016] 2. Both the air inlet section and the air blowing section are straight tube structures, which is convenient for the installation of the air tube body;

[0017] 3. The diameter of the air inlet of the air duct body is larger than the diameter of its air outlet, and the length of the contraction section is smaller than the length of the diffusion section, so that the air duct body is more in line with the principle of aerodynamics, and a higher wind speed can be obtained at the air outlet, and the kinetic energy loss at the air outlet is small, which improves the efficiency of the air blowing component and reduces the energy consumption of the air blowing component;

[0018] 4. Since the contraction angle β is large and the diameter of the air inlet is large, the air reaching the blast section can still obtain a higher flow rate and dynamic pressure under the condition that the length of the contraction section is short, further reducing energy consumption and saving materials;

[0019] 5. Both the contraction section and the diffusion section are trumpet-shaped linear cylindrical structures. The inner diameter of the contraction section gradually decreases from the air inlet section to the blast section, and the inner diameter of the diffusion section gradually increases from the blast section to the cooling tower, which can increase the air inlet and outlet areas and the overall air intake of the cooling tower. At the same time, compared with the straight tube structure, it can save manufacturing materials;

[0020] 6. The upper surface of the reducer is arc-shaped, which can reduce the air resistance in the contraction section. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the air duct for the blast cooling tower of the utility model;

[0022] Figure 2 It is a cross-sectional schematic diagram of the connection between the air duct for the blast cooling tower of the utility model and the cooling tower;

[0023] Figure 3 The utility model is a schematic structural diagram of the connection between the air duct and the mounting bracket for the blast cooling tower.

[0024] Reference numerals: 1. air cylinder body; 2. air blowing assembly; 3. air inlet section; 4. contraction section; 5. air blowing section;

[0025] 6. Diffuser; 7. Install angle plate; 8. Install bracket; 11. Air inlet; 12. Air outlet;

[0026] 21. Blade assembly; 22. Motor; 23. Reducer; 24. Mounting plate; 25. Mounting frame. DETAILED DESCRIPTION

[0027] In order to make the content of the utility model more clearly understood, the utility model is further described in detail below based on specific embodiments and in conjunction with the accompanying drawings.

[0028] like Figure 1-3 As shown, in the present embodiment, a duct for a blast-type cooling tower is provided, comprising a duct body 1, in which a blast assembly 2 is installed, the duct body 1 being a cylindrical structure formed by an air inlet section 3, a contraction section 4, a blast section 5 and a diffusion section 6 which are fixedly connected in sequence, the blast assembly 2 comprising a blade assembly 21 rotatably installed on the blast section 5, the duct body 1 having an air inlet 11 and an air outlet 12, the air inlet 11 of the duct body 1 being the end of the air inlet section 3 away from the contraction section 4, the air outlet 12 of the duct body 1 being the end of the diffusion section 6 away from the blast section 5, and the air outlet 12 of the duct body 1 being communicated with the cooling tower 100.

[0029] like Figure 1-2As shown, in the present embodiment, the air inlet section 3 and the blast section 5 are both straight-tube structures, the contraction section 4 and the diffusion section 6 are both trumpet-shaped linear-tube structures, the inner diameter of the contraction section 4 gradually decreases from the air inlet section 3 to the blast section 5, and the inner diameter of the diffusion section 6 gradually increases from the blast section 5 to the cooling tower 100, and the ends with smaller inner diameters of the contraction section 4 and the diffusion section 6 are fixedly connected to the two ends of the blast section 5, respectively.

[0030] like Figure 1-2 As shown, in the present embodiment, the diameter of the air inlet 11 of the air duct body 1 is larger than the diameter of the air outlet 12 thereof, and the length of the contraction section 4 is smaller than the length of the diffusion section 6, which makes the diffusion angle α smaller than the contraction angle β, the diffusion angle α being the angle between the diffusion section 6 and the axis of the air duct body 1, and the contraction angle β being the angle between the contraction section 4 and the axis of the air duct body 1.

[0031] Specifically, according to the Venturi effect, when a fluid passes through a reduced flow cross-section, the flow velocity increases, and the flow velocity is inversely proportional to the flow cross-section. The air enters the air duct body 1 through the air inlet 11. When the air reaches the contraction section 4, as the inner diameter of the contraction section 4 gradually decreases, the flow velocity of the air gradually increases, and its dynamic pressure increases. Subsequently, the blade assembly 21 of the blast section 5 rotates to do work on the air. When the blade assembly 21 rotates, its mechanical energy is converted into kinetic energy of the air, so that the air has a certain amount of energy and enters the diffusion section 6. As the inner diameter of the diffusion section 6 gradually increases, the flow of the air As the speed decreases, the kinetic energy of the air gradually decreases, and the dynamic pressure of the air decreases, so that the air flow rate at the air outlet 12 is more uniform. At the same time, since the diameter of the air inlet 11 of the air duct body 1 is larger than the diameter of its air outlet 12, and the length of the contraction section 4 is smaller than the length of the diffusion section 6, the air duct body 1 is more in line with the principles of aerodynamics, so that a higher wind speed can be obtained at the air outlet 12, and the kinetic energy loss at the air outlet 12 is small, which improves the efficiency of the blower assembly 2, reduces the energy consumption of the blower assembly 2, and significantly increases the ventilation volume of the cooling tower 100, and greatly improves the thermal performance of the cooling tower 100.

[0032] like Figure 1-3 As shown, in the present embodiment, the air inlet section 3 and the air blowing section 5 are both straight-cylinder structures, which can facilitate the installation of the air duct body 1. Specifically, mounting angle plates 7 are fixedly installed on the outer walls of the air inlet section 3 and the air blowing section 5. The air duct body 1 is fixedly connected to a mounting bracket 8 fixedly installed on the ground through the mounting angle plates 7 on the outer walls of the air inlet section 3 and the air blowing section 5, so as to improve the supporting strength of the air duct body 1. At the same time, the material of the air duct body 1 is stainless steel, which is lighter than the traditional concrete material, reduces the pressure-bearing capacity requirement of the mounting bracket 8, improves the seismic performance, and makes the overall structure more stable. At the same time, the straight-cylinder-shaped air inlet section 3 can allow air to enter the air duct body 1 at a uniform speed to reduce resistance.

[0033] like Figure 1-2 As shown, in the present embodiment, the contraction section 4 and the diffusion section 6 are both trumpet-shaped linear cylindrical structures, the inner diameter of the contraction section 4 gradually decreases from the air inlet section 3 to the blast section 5, and the inner diameter of the diffusion section 6 gradually increases from the blast section 5 to the cooling tower 100, which can increase the air inlet and outlet areas, and increase the overall air intake of the cooling tower 100. At the same time, compared with the straight tube structure, it can save manufacturing materials. At the same time, due to the large angle of the contraction angle β and the large diameter of the air inlet 11, under the condition of a short length of the contraction section 4, the air reaching the blast section 5 can still obtain a higher flow rate and dynamic pressure, further reducing energy consumption and saving materials.

[0034] like Figure 2 As shown, in the present embodiment, the blowing assembly 2 also includes a driving assembly fixedly mounted in the wind cylinder body 1 and used for driving the blade assembly 21 to rotate, the driving assembly includes a motor 22 and a reducer 23, the central axis of the blade assembly 21 is fixedly connected to the output shaft of the motor 22 via the reducer 23, specifically, a mounting plate 24 is provided in the contraction section 4, the motor 22 and the reducer 23 are both fixedly mounted on the mounting plate 24, a mounting frame 25 is fixedly connected below the mounting plate 24, and the mounting frame 25 is fixedly mounted on the inner wall of the contraction section 4.

[0035] like Figure 2 As shown, in this embodiment, the diameter of the blade assembly 21 corresponds to the inner diameter of the blowing section 5, so that the air flowing through the blowing section 5 can be fully stirred by the blade assembly 21, so that when the blade assembly 21 rotates, its mechanical energy can be fully converted into the kinetic energy of the air, thereby improving the working effect of the blade assembly 21.

[0036] like Figure 2 As shown, in this embodiment, in order to reduce the air resistance of the contraction section 4, the upper surface of the reducer 23 is arc-shaped.

[0037] In summary, the advantages of the utility model are as follows: the material of the air duct body 1 is stainless steel, which is lighter than the traditional concrete material, reduces the pressure bearing capacity requirement of the mounting bracket 8, improves the seismic performance, and makes the overall structure more stable; the air inlet section 3 and the air blowing section 5 are both straight cylinder structures, which can facilitate the installation of the air duct body 1; the diameter of the air inlet 11 of the air duct body 1 is larger than the diameter of its air outlet 12, and the length of the contraction section 4 is smaller than the length of the diffusion section 6, so that the air duct body 1 is more in line with the aerodynamic principle, and the air outlet 12 can be placed at a relatively close distance. A higher wind speed can be obtained, and the kinetic energy loss at the air outlet 12 is small, which improves the efficiency of the blower assembly 2, reduces the energy consumption of the blower assembly 2, and significantly increases the ventilation volume of the cooling tower 100, and greatly improves the thermal performance of the cooling tower 100; since the contraction angle β is large and the diameter of the air inlet 11 is large, the air reaching the blower section 5 can still obtain a higher flow rate and dynamic pressure under the condition that the length of the contraction section 4 is short, thereby further reducing energy consumption and saving materials; the upper surface of the reducer 23 is arc-shaped, which can reduce the air resistance of the contraction section 4.

[0038] The specific embodiments described above further illustrate the technical problems, technical solutions and beneficial effects solved by the present invention. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A blast cooling tower air duct, comprising an air duct body (1), characterized in that: A blower assembly (2) is installed in the wind duct body (1). The wind duct body (1) is a cylindrical structure formed by an air inlet section (3), a contraction section (4), a blower section (5) and a diffuser section (6) which are fixedly connected in sequence. The blower assembly (2) comprises a blade assembly (21) rotatably mounted on the blower section (5) and a drive assembly fixedly mounted on the inner wall of the contraction section (4) for driving the blade assembly (21) to rotate. The wind duct body (1) has an air inlet (11) and an air outlet (12). The air outlet (12) is connected to the cooling tower (100). The air inlet section (3) and the blower section (5) are both straight-tube structures. The contraction section (4) and the diffuser section (6) are both trumpet-shaped linear cylindrical structures. The diameter of the air inlet (11) is greater than the diameter of the air outlet (12), and the length of the contraction section (4) is less than the length of the diffuser section (6).

2. The air duct for a blast cooling tower according to claim 1, characterized in that: The inner diameter of the contraction section (4) gradually decreases from the air inlet section (3) to the blast section (5), and the inner diameter of the diffusion section (6) gradually increases from the blast section (5) to the cooling tower (100). The ends with smaller inner diameters of the contraction section (4) and the diffusion section (6) are respectively fixedly connected to the two ends of the blast section (5).

3. The air duct for a blast cooling tower according to claim 1, characterized in that: An installation angle plate (7) is fixedly mounted on the outer walls of the air inlet section (3) and the air blowing section (5), and the air duct body (1) is fixedly connected to an installation bracket (8) fixedly mounted on the ground via the installation angle plate (7).

4. The air duct for a blast cooling tower according to claim 1, characterized in that: The angle between the diffusion section (6) and the axis of the wind tube body (1) is the diffusion angle, and the angle between the contraction section (4) and the axis of the wind tube body (1) is the contraction angle. The diffusion angle is smaller than the contraction angle.

5. The air duct for a blast cooling tower according to claim 1, characterized in that: The driving assembly comprises a motor (22) and a reducer (23), and the central axis of the blade assembly (21) is fixedly connected to the output shaft of the motor (22) via the reducer (23).

6. The air duct for a blast cooling tower according to claim 5, characterized in that: A mounting plate (24) is provided in the contraction section (4), the motor (22) and the reducer (23) are both fixedly mounted on the mounting plate (24), a mounting frame (25) is fixedly connected below the mounting plate (24), and the mounting frame (25) is fixedly mounted on the inner wall of the contraction section (4).

7. The air duct for a blast cooling tower according to claim 5, characterized in that: The upper surface of the reducer (23) is arc-shaped.

8. The air duct for a blast cooling tower according to claim 1, characterized in that: The diameter of the blade assembly (21) corresponds to the inner diameter of the blowing section (5).

Images