High-efficiency film-forming water distributor for evaporative cooler

Abstract

The present invention provides an efficient film-forming water distributor for an evaporative cooler, which consists of three parts: a water delivery pipe, a water distribution pipe, and a fixing device. The water delivery pipe includes a main water delivery pipe and a control valve. The water distribution pipe includes a right water distribution pipe, a left water distribution pipe, and a unit water distribution pipe. The fixing device includes a rear support of the water distributor, a front support of the water distributor, and a fixing device for the water distribution pipe. The spray water enters the water distribution pipe from the water delivery pipe and is tangentially distributed on the surface of the evaporative cooler through a slit outlet, so that a uniform and complete water film can be formed on the surface of the evaporative cooler under different air flow velocity conditions, ensuring efficient heat exchange of the evaporative cooler.

Description

Technical Field

[0001] The present invention provides an efficient film-forming water distributor for an evaporative cooler, belonging to the mechanical field, aiming to ensure the formation of a uniform and complete water film on the surface of the evaporative cooler, and solve the problem of low heat exchange efficiency caused by poor uniformity and integrity of the water film on the surface of the existing evaporative cooler. Background Art

[0002] Currently, most evaporative coolers distribute water at the top of the heat exchange coil. Due to the action of surface tension and viscous force, the uniformity and integrity of the water film on the surface of the evaporative cooler are not ideal enough, and even local areas are dry surfaces. Before the water droplets formed by the existing water distribution method reach the surface of the evaporative cooler to form a water film, heat and mass transfer have occurred between the water droplets and the air, resulting in a significant increase in air humidity.

[0003] The difference between the saturated air pressure on the water film surface and the partial pressure of water vapor in the mainstream air is the driving force for the heat and mass transfer process of the evaporative cooler. However, due to the limitations of the traditional water distribution method, before the sprayed water forms a water film on the surface of the evaporative cooler, heat and mass transfer with the air cause an increase in air humidity. That is, the increase in air humidity is not due to heat and mass transfer between the water film and the wall of the evaporative cooler, but due to heat and mass transfer between the water droplets and the air before film formation. Therefore, the heat dissipation capacity of the air cannot be fully utilized, and the heat transfer efficiency of the evaporative cooler is low.

[0004] In response to the above problems, the research group proposed in "Evaporative Water Make-up Device (ZL2009103003918)" to use the reaction force of ambient air on the airflow at the nozzle outlet to drive the device to rotate and distribute water on the side of the heat exchanger, improving the uniformity and integrity of the water film; in a series of equipment technologies such as "Rotary Water Distributor (ZL2011103411312)", "Air Atomization Distribution Device for Two-Side Rotary Water Distributor (ZL2013201382945)", "Pressure Atomization Distribution Device for Two-Side Rotary Water Distributor (ZL2013201382945)" and "Two-Side Rotary Indirect Evaporative Cooler (ZL2013201383026)", key defects such as high operating energy consumption, unstable operation, and oil leakage of ZL2009103003918 were solved; in "Plate-Type Evaporative Cooler with Water Film Reconstruction (201911115650x)" and "Tube-Type Evaporative Cooler with Water Film Reconstruction (2019111148895)", water film reconstruction was proposed to ensure the formation of a complete water film on the surface of the evaporative cooler, solving the problems that the sprayed water droplets still weaken the latent heat exchange ability of the air to a certain extent, some atomized droplets directly conduct heat and mass transfer with the air, do not participate in removing the heat of the high-temperature medium inside the evaporative cooler, and the heat dissipation capacity of the air cannot be maximally utilized, as well as the problem that the heat transfer coefficient between the water film and the wall is too small. The water film reconstruction basically solves the problem of incomplete water film on the surface of the evaporative cooler.

[0005] However, the water film thickness and velocity distribution after multiple water film reconstructions may not be the most suitable for heat and mass transfer in the evaporative cooler. There may be a problem of unnecessary water film reconstruction for multiple times. The above cases do not involve how to ensure that the sprayed water can form a water film with the best uniformity and integrity on the surface of the evaporative cooler under different spray water volumes, different air flow velocities, different tube types, tube diameters and arrangement methods. Summary of the Invention

[0006] The present invention aims to propose an efficient film-forming water distributor for an evaporative cooler to solve the above problems, specifically:

[0007] The efficient film-forming water distributor for an evaporative cooler comprises three parts: a water delivery pipe, a water distribution pipe and a fixing device. It is characterized in that: the water delivery pipe comprises a main water delivery pipe (1) and a valve (13), the water distribution pipe comprises a right water distribution pipe (2), a left water distribution pipe (3) and a unit water distribution pipe (4), the fixing device comprises a rear support (5) of the water distributor, a front support (6) of the water distributor and a fixing device (7) for the water distribution pipe. The right water distribution pipe (2), the left water distribution pipe (3) and the unit water distribution pipe (4) are arranged in parallel and connected to the main water delivery pipe (1). The two ends of the right water distribution pipe (2), the left water distribution pipe (3) and the unit water distribution pipe (4) are respectively fixed on the rear support (5) of the water distributor and the front support (6) of the water distributor through the fixing device (7) for the water distribution pipe. The sprayed water enters from the main water delivery pipe (1), and the spray volume is controlled by the valve (13) and distributed to the right water distribution pipe (2), the left water distribution pipe (3) and the unit water distribution pipe (4) to be sprayed onto the surface of the evaporative cooler.

[0008] The water distribution pipe forms a film by using nozzles (12). A certain number of nozzles (12) are arranged on the left side of the right water distribution pipe (2), the right side of the left water distribution pipe (3) and both sides of the unit water distribution pipe (4). The number of nozzles (12) is determined by dividing the length of the heat exchanger coil by the effective atomization angle of a single nozzle. The effective atomization angles of adjacent nozzles (12) are in the same plane and are connected to each other.

[0009] The included angle between the nozzle axis of the nozzle (12) on the right water distribution pipe (2) and the vertical axis of the cross section of the right water distribution pipe (2) is not greater than 90°. The included angle between the nozzle axis of the nozzle (12) on the left water distribution pipe (3) and the vertical axis of the cross section of the left water distribution pipe (3) is not greater than 90°. The included angle between the axes of the nozzles (12) arranged on both sides of the unit water distribution pipe (4) is not greater than 180°, ensuring that the sprayed water enters tangentially along the surface of the evaporative cooler to form a water film.

[0010] The water distribution pipe forms a film freely by using slit outlets (8). Slit outlets (8) are respectively arranged on the left side of the right water distribution pipe (2), the right side of the left water distribution pipe (3) and both sides of the unit water distribution pipe (4).

[0011] The included angle between the axis of the strip-shaped outflow opening (8) on the right water distribution pipe (2) and the vertical axis of the cross-section of the right water distribution pipe (2) is not greater than 90°. The included angle between the axis of the strip-shaped outflow opening (8) on the left water distribution pipe (3) and the vertical axis of the cross-section of the left water distribution pipe (3) is not greater than 90°. The included angle between the axes of the strip-shaped outflow openings (8) provided on both sides of the unit water distribution pipe (4) is not greater than 180°, ensuring that the spray water enters tangentially along the surface of the evaporative cooler to form a water film.

[0012] A water collecting plate is arranged at the lower part of the water distribution pipe to guide the spray water to form a film. A left water collecting plate (10) is arranged on the right water distribution pipe (2), a right water collecting plate (11) is arranged on the left water distribution pipe (3), and a unit water collecting plate (9) is arranged on the unit water distribution pipe (4). The unit water collecting plate (9), the left water collecting plate (10) and the right water collecting plate (11) are provided with an inclination angle, ensuring that the spray water enters tangentially along the surface of the evaporative cooler to form a water film.

[0013] The water distribution pipe uses one or a combination of several of the following methods to form a film: using a nozzle (12) to form a film, freely forming a film through the strip-shaped outflow opening (8), and guiding the spray water to form a film by the water collecting plate.

[0014] The main innovation of the present invention lies in:

[0015] According to the spray water volume, air flow velocity, tube type, tube diameter and layout mode of the evaporative cooler, the evaporative cooler high-efficiency film-forming water distributor uses one or a combination of several of the three auxiliary film-forming methods of the nozzle (12), the strip-shaped outflow opening (8) and the water collecting plate to form a water distribution pipe with an optimal structure. By adjusting the angles of the nozzle (12), the strip-shaped outflow opening (8) and the water collecting plate as shown in FIGS. Figure 3 、 4 6, 7, 9, ensure that at different air flow velocities, the spray water enters tangentially from the most favorable direction for forming a film on the surface of the evaporative cooler, forming a complete water film in the height direction of the evaporative cooler to the greatest extent. For small evaporative coolers, there is no need to reconstruct the water film. For medium and large evaporative coolers, the water film is reconstructed as few times as possible, improving the heat transfer performance, reliability and stability of the evaporative cooler, and minimizing the equipment cost to the greatest extent.

[0016] The main advantages of the present invention are:

[0017] According to the spray water volume, air flow velocity, tube type, tube diameter and layout mode of the evaporative cooler, a water film most beneficial to heat and mass transfer is formed on the surface of the evaporative cooler, maximizing the use of the heat dissipation capacity of the air and optimizing the number of times of water film reconstruction. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The top view of the evaporative cooler high-efficiency film-forming water distributor using the nozzle to form a film in Embodiment 1;

[0019] Figure 2Cross-sectional view of the unit water distribution pipe A-A for Example 1;

[0020] Figure 3 Cross-sectional view of the left water distribution pipe B-B for Example 1;

[0021] Figure 4 Top view of the high-efficiency film-forming water distributor of the evaporative cooler using a water collection plate to form a film for Example 2;

[0022] Figure 5 Cross-sectional view of the unit water distribution pipe C-C for Example 2;

[0023] Figure 6 Cross-sectional view of the left water distribution pipe D-D for Example 2;

[0024] Figure 7 Top view of the high-efficiency film-forming water distributor of the evaporative cooler using a slotted outlet for Example 3;

[0025] Figure 8 Cross-sectional view of the water distribution pipe fixing device E-E;

[0026] Figure 9 Cross-sectional view of the unit water distribution pipe F-F for Example 3. Detailed implementation manners

[0027] The high-efficiency film-forming water distributor of the evaporative cooler according to the present invention will be further described in conjunction with the accompanying drawings:

[0028] Example 1: The specific implementation manner is described by taking the high-efficiency film-forming water distributor of the evaporative cooler that forms a film with the nozzle (12).

[0029] The high-efficiency film-forming water distributor of the evaporative cooler comprises three parts: a water delivery pipe, a water distribution pipe, and a fixing device. It is characterized in that: the water delivery pipe comprises a main water delivery pipe (1) and a valve (13), the water distribution pipe comprises a right water distribution pipe (2), a left water distribution pipe (3), and a unit water distribution pipe (4), the fixing device comprises a rear support (5) of the water distributor, a front support (6) of the water distributor, and a water distribution pipe fixing device (7). The right water distribution pipe (2), the left water distribution pipe (3), and the unit water distribution pipe (4) are arranged in parallel and connected to the main water delivery pipe (1). The two ends of the right water distribution pipe (2), the left water distribution pipe (3), and the unit water distribution pipe (4) are respectively fixed on the rear support (5) of the water distributor and the front support (6) of the water distributor through the water distribution pipe fixing device (7). The spray water enters from the main water delivery pipe (1), and the spray amount is controlled by the valve (13), and is distributed to the right water distribution pipe (2), the left water distribution pipe (3), and the unit water distribution pipe (4) and sprayed onto the surface of the evaporative cooler.

[0030] The water distribution pipes form a film using nozzles (12). A certain number of nozzles (12) are arranged on the left side of the right water distribution pipe (2), the right side of the left water distribution pipe (3), and both sides of the unit water distribution pipe (4). The number of nozzles (12) is determined by dividing the length of the heat exchanger coil by the effective atomization angle of a single nozzle. The effective atomization angles of adjacent nozzles (12) are in the same plane and are connected to each other.

[0031] The angle between the nozzle axis of the nozzles (12) on the right water distribution pipe (2) and the vertical axis of the cross-section of the right water distribution pipe (2) is not greater than 90°. The angle between the nozzle axis of the nozzles (12) on the left water distribution pipe (3) and the vertical axis of the cross-section of the left water distribution pipe (3) is not greater than 90°. The angle between the axes of the nozzles (12) arranged on both sides of the unit water distribution pipe (4) is not greater than 180°, ensuring that the sprayed water enters tangentially along the surface of the evaporative cooler to form a water film.

[0032] The evaporative cooler high-efficiency film-forming water distributor using nozzles (12) to form a film is suitable for tubular evaporative coolers or plate evaporative coolers when the air flow velocity is relatively high.

[0033] Example 2: The specific implementation manner is described by an evaporative cooler high-efficiency film-forming water distributor that forms a film using a water collecting plate.

[0034] Based on Example 1, a water collecting plate is arranged below the water distribution pipes to guide the sprayed water to form a film. A left water collecting plate (10) is arranged on the right water distribution pipe (2), a right water collecting plate (11) is arranged on the left water distribution pipe (3), and a unit water collecting plate (9) is arranged on the unit water distribution pipe (4). The unit water collecting plate (9), the left water collecting plate (10), and the right water collecting plate (11) are set at an inclination angle to ensure that the sprayed water enters tangentially along the surface of the evaporative cooler to form a water film.

[0035] The evaporative cooler high-efficiency film-forming water distributor that uses a water collecting plate to guide the sprayed water to form a film is suitable for plate evaporative coolers or tube-and-plate evaporative coolers when the sprayed water volume is small and the air flow velocity is relatively high.

[0036] Example 3: The specific implementation manner is described by an evaporative cooler high-efficiency film-forming water distributor that freely forms a film using a slotted outlet (8).

[0037] Based on Example 1, the water distribution pipes freely form a film using slotted outlets (8). Slotted outlets (8) are respectively arranged on the left side of the right water distribution pipe (2), the right side of the left water distribution pipe (3), and both sides of the unit water distribution pipe (4).

[0038] The included angle between the axis of the slot outlet (8) on the right water distribution pipe (2) and the vertical axis of the cross-section of the right water distribution pipe (2) is not greater than 90°. The included angle between the axis of the slot outlet (8) on the left water distribution pipe (3) and the vertical axis of the cross-section of the left water distribution pipe (3) is not greater than 90°. The included angle between the axes of the slot outlets (8) arranged on both sides of the unit water distribution pipe (4) is not greater than 180°, ensuring that the spray water enters tangentially along the surface of the evaporative cooler to form a water film.

[0039] The high-efficiency film-forming water distributor of the evaporative cooler using the slot outlet (8) to freely form a film is suitable for plate evaporative coolers or tube-and-plate evaporative coolers with a relatively low air flow rate and a relatively large spray water volume.

[0040] The above three embodiments can be used alone, or two or three of them can be combined and used according to the air flow rate, the structural type of the evaporative cooler, the layout method, and the heat exchange capacity of the evaporative cooler.

[0041] The above is only the preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions within the idea of the present invention belong to the protection scope of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. The high-efficiency film-forming water distributor of an evaporative cooler comprises three parts: a water delivery pipe, a water distribution pipe and a fixing device, and is characterized in that: The water delivery pipe includes a main water delivery pipe (1) and a valve (13). The water distribution pipes include a right water distribution pipe (2), a left water distribution pipe (3), and a unit water distribution pipe (4). The fixing device includes a rear support of the water distributor (5), a front support of the water distributor (6), and a fixing device for the water distribution pipes (7). The right water distribution pipe (2), the left water distribution pipe (3), and the unit water distribution pipe (4) are arranged in parallel and connected to the main water delivery pipe (1). The two ends of the right water distribution pipe (2), the left water distribution pipe (3), and the unit water distribution pipe (4) are respectively fixed on the rear support of the water distributor (5) and the front support of the water distributor (6) through the fixing device for the water distribution pipes (7). The spraying water enters from the main water delivery pipe (1), and the spraying amount is controlled by the valve (13) and distributed to the right water distribution pipe (2), the left water distribution pipe (3), and the unit water distribution pipe (4) to be sprayed onto the surface of the evaporative cooler. The water distribution pipes adopt a combination of forming a film with nozzles (12), freely forming a film at the slit outlet (8), and guiding the spraying water to form a film by a water collecting plate. A water collecting plate is arranged below the water distribution pipes to guide the spraying water to form a film. A left water collecting plate (10) is arranged on the right water distribution pipe (2), a right water collecting plate (11) is arranged on the left water distribution pipe (3), and a unit water collecting plate (9) is arranged on the unit water distribution pipe (4). The unit water collecting plate (9), the left water collecting plate (10), and the right water collecting plate (11) are provided with an inclination angle to ensure that the spraying water enters tangentially along the surface of the evaporative cooler to form a water film. A certain number of nozzles (12) are arranged on the left side of the right water distribution pipe (2), the right side of the left water distribution pipe (3), and both sides of the unit water distribution pipe (4). The number of nozzles (12) is determined by dividing the length of the heat exchanger coil by the effective atomization angle of a single nozzle. The effective atomization angles of adjacent nozzles (12) are in the same plane and are connected to each other. Slit outlets (8) are respectively arranged on the left side of the right water distribution pipe (2), the right side of the left water distribution pipe (3), and both sides of the unit water distribution pipe (4).

2. The high-efficiency film-forming water distributor of an evaporative cooler according to claim 1, characterized in that: The included angle between the axis of the nozzle (12) on the right water distribution pipe (2) and the vertical axis of the cross-section of the right water distribution pipe (2) is not greater than 90°. The included angle between the axis of the nozzle (12) on the left water distribution pipe (3) and the vertical axis of the cross-section of the left water distribution pipe (3) is not greater than 90°. The included angle between the axes of the nozzles (12) arranged on both sides of the unit water distribution pipe (4) is not greater than 180°, ensuring that the spraying water enters tangentially along the surface of the evaporative cooler to form a water film.

3. The high-efficiency film-forming water distributor of an evaporative cooler according to claim 1, characterized in that: The included angle between the axis of the slit outlet (8) on the right water distribution pipe (2) and the vertical axis of the cross-section of the right water distribution pipe (2) is not greater than 90°. The included angle between the axis of the slit outlet (8) on the left water distribution pipe (3) and the vertical axis of the cross-section of the left water distribution pipe (3) is not greater than 90°. The included angle between the axes of the slit outlets (8) arranged on both sides of the unit water distribution pipe (4) is not greater than 180°, ensuring that the spraying water enters tangentially along the surface of the evaporative cooler to form a water film.

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