Air water taking device with pre-cooling structure

Abstract

The utility model relates to the technical field of air water taking, in particular to an air water taking device with a precooling structure, which comprises an adsorption box, a surface air cooler and a heat pump mechanism, a first airflow pipe is connected between the adsorption box and the surface air cooler, and the heat pump mechanism comprises an evaporator, a compressor, a condenser and an expansion valve; a second airflow pipe is connected between the evaporator and the surface air cooler, and wet and hot airflow desorbed from the adsorption box enters the surface air cooler through the first airflow pipe to be cooled and condensed, passes through the evaporator through the second airflow pipe to be cooled and condensed and then is discharged; a water return pipe is connected between the evaporator and the surface air cooler, a spiral pipe is installed in the surface air cooler, and the water inlet end of the spiral pipe is connected with the water outlet end of the water return pipe. And the condenser is mounted below the air inlet at the bottom end of the adsorption box. Condensate water formed by the tail end evaporator is used as cooling water of the middle surface air cooler, and the preheating effect of the condenser in the desorption process is achieved, so that compared with cooling water collection of a traditional adsorption type air water taking device, energy is saved by more than 50%.

Description

Technical Field

[0001] This utility model relates to the field of air water extraction technology, and in particular to an air water extraction device with a pre-cooling structure. Background Technology

[0002] As an unconventional water resource, atmospheric water has the characteristics of rapid renewal and circulation, large dynamic storage, and convenient on-site utilization. This makes atmospheric water extraction technology a feasible method to solve the water shortage problem in arid areas. Currently, there are three main atmospheric water extraction technologies: cooling condensation method, fog extraction method, and adsorption method. Among them, the adsorption method has the characteristics of low energy consumption and low cost, and is currently the focus of research at home and abroad. It can complete the water extraction and production cycle at low humidity, but it is necessary to select suitable adsorption materials and design the device reasonably to increase the water production.

[0003] Chinese patent CN202410606415.7 discloses a solar-powered condensation-adsorption type high-efficiency air-to-water device and method, which provides power to a water circulation system and a condensation-type water production system using solar energy. The heat dissipation from the condensation-type water production system provides a heat source for the desorption process of the adsorption-type water production system, and the water circulation system provides cooling capacity for the incoming air. This device is compact, with multiple systems interleaved for water extraction, and a high water extraction capacity. However, the entire system is complex, has low reliability, is only suitable for areas with abundant solar energy, and requires an additional cooling water supply.

[0004] Chinese Patent CN202311372763.4 describes an air-based water collection device and its application based on gel water absorption and dehydration. It utilizes water-absorbing gel and photothermal materials to create a dual driving force of vertical temperature and concentration gradients, making efficient water collection possible. The system is energy-saving and environmentally friendly, requiring no additional energy transmission. However, it has a small water collection capacity and low efficiency, failing to meet the needs of large-scale water collection.

[0005] Chinese patent CN202410886285.7 discloses a heat pump-driven absorption-type air-to-water system that uses a hygroscopic solution to absorb moisture from the air and couples it to a heat pump system. The system utilizes an evaporator to provide cooling for a stable and rapid absorption process of the solution, and a condenser to provide heat for solution regeneration. The system has compact components and can achieve a high volumetric water extraction rate at the equipment level. However, the hygroscopic solution requires high sealing performance, which increases the size and weight of the equipment. At the same time, the impact of the solution on the corrosion life of the equipment must be considered.

[0006] To address the issue of high energy consumption caused by significant temperature variations during the operation of adsorption-type air-to-water devices, the solutions mentioned in the above and other patent documents involve using solar power or heating, or multi-system coupling for energy saving. However, these solutions are highly dependent on the environment and have low adaptability to different operating conditions. Utility Model Content

[0007] In view of this, the purpose of this utility model is to provide an air water collection device with a pre-cooling structure, so as to at least solve the problems of high energy consumption, low water collection volume and strong dependence on the environment of existing air water collection devices.

[0008] This utility model solves the above-mentioned technical problems through the following technical means:

[0009] This utility model embodiment provides an air water collection device with a pre-cooling structure, including an adsorption box, a surface cooler, and a heat pump mechanism. The bottom end of the adsorption box has an air inlet, and the air outlet end of the adsorption box is connected to the surface cooler by a first airflow pipe. The heat pump mechanism includes an evaporator, a compressor, a condenser, and an expansion valve connected in sequence. The inlet end of the expansion valve is connected to the condenser, and the outlet end of the expansion valve is connected to the evaporator.

[0010] A second airflow pipe connects the evaporator and the surface cooler. The evaporator is installed at the outlet end of the second airflow pipe. The hot and humid airflow desorbed from the adsorption box enters the surface cooler through the first airflow pipe for the first cooling and condensation, and then passes through the second airflow pipe and the evaporator for the second cooling and condensation before being discharged. A return water pipe is also connected between the bottom end of the evaporator and the surface cooler. A spiral coil with an inclination from top to bottom is installed inside the surface cooler. The water inlet end of the spiral coil is connected to the water outlet end of the return water pipe. The condenser is installed below the air inlet.

[0011] Optionally, the airflow outlet end of the adsorption box is higher than the airflow inlet end of the surface cooler in the vertical direction, and the first airflow pipe is installed obliquely between the adsorption box and the surface cooler.

[0012] Optionally, the first airflow pipe has at least one exhaust window on its wall, and the exhaust window is fitted with a sealing cover.

[0013] Optionally, a plurality of heat dissipation fins are provided on the outer wall of the first airflow pipe, and the plurality of heat dissipation fins are evenly distributed on the outer wall of the first airflow pipe.

[0014] Optionally, the second airflow pipe is installed at an angle between the surface cooler and the evaporator, and the airflow outlet end of the surface cooler is lower than the airflow outlet end of the second airflow pipe in the vertical direction.

[0015] Optionally, the return water pipe is installed at an angle between the surface cooler and the evaporator, with the inlet end of the return water pipe higher than the inlet end of the spiral coil.

[0016] Optionally, a water receiving tray is installed at the bottom of the surface cooler, and a water tank is installed below the water receiving tray. The water tank and the water receiving tray are connected, and the water outlet of the spiral coil is connected to the water receiving tray.

[0017] Optionally, the adsorption box is equipped with a multi-layer adsorption bed, the adsorption bed is loaded with water-absorbing material, and a heating layer is installed below the adsorption bed.

[0018] Optionally, a fan is installed on the top of the adsorption box, and the fan is a stepless speed-regulating fan.

[0019] Optionally, temperature and humidity sensors are installed at the air inlet of the adsorption box, inside the first airflow pipe, inside the second airflow pipe, and at the airflow outlet of the evaporator.

[0020] This utility model discloses an air-to-water collection device with a pre-cooling structure. It abandons the traditional adsorption-type air-to-water collection method that relies entirely on refrigeration equipment for condensation. Instead, it uses a heat pump mechanism as the driving force for heating and cooling. The condenser is installed at the air inlet of the adsorption box to preheat the air entering the desorption process. The surface cooler is installed in the middle section of the air duct. The condensate formed by the terminal evaporator is used as the cooling water for the intermediate surface cooler. It makes full use of traditional waste heat for pre-cooling treatment. Combined with the preheating effect of the condenser in the desorption process, it saves more than 50% energy compared to the cooling water collection of traditional adsorption-type air-to-water collection devices. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of an air-water extraction device with a pre-cooling structure according to the present invention;

[0022] Figure 2 yes Figure 1 An enlarged schematic diagram of the first airflow tube in the process;

[0023] The components include an adsorption box 100, an air inlet 110, an adsorption bed 120, an installation mesh plate 130, a heating layer 140, a fan 150, a surface cooler 200, a spiral coil 210, a water receiving tray 220, a heat pump mechanism 300, an evaporator 310, a compressor 320, a condenser 330, an expansion valve 340, a first airflow pipe 400, an exhaust window 410, a sealing cover 420, heat dissipation fins 430, a second airflow pipe 500, a return water pipe 600, and a water tank 700. Detailed Implementation

[0024] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can understand the advantages and effects of this utility model from the content disclosed in this specification. It should be noted that the illustrations provided in the following embodiments are for illustrative purposes only and represent schematic diagrams, not actual pictures. They should not be construed as limiting the utility model. To better illustrate the embodiments of this utility model, some components in the figures may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable that some well-known structures and their descriptions may be omitted in the figures for those skilled in the art.

[0025] In the figures of this utility model embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper", "lower", "left", "right", "front", "rear", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the figure, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe the positional relationship in the figure are only for illustrative purposes and should not be construed as limiting this utility model. For those skilled in the art, the specific meaning of the above-mentioned terms can be understood according to the specific circumstances.

[0026] like Figure 1 and Figure 2 As shown, this utility model discloses an air-to-water device with a pre-cooling structure, comprising an adsorption box 100, a surface cooler 200, and a heat pump mechanism 300. The bottom end of the adsorption box 100 has an air inlet 110, and a first airflow pipe 400 connects the airflow outlet end of the adsorption box 100 to the surface cooler 200. The heat pump mechanism 300 is a device that transfers heat energy from a low-temperature heat source to a high-temperature heat source to achieve cooling and heating. In this embodiment, the heat pump mechanism 300 adopts a conventional heat pump mechanism 300, which includes an evaporator 310, a compressor 320, a condenser 330, and an expansion valve 340 connected in sequence. The inlet end of the expansion valve 340 is connected to the condenser 330, and the outlet end of the expansion valve 340 is connected to the evaporator 310. A second airflow pipe 500 connects the evaporator 310 and the surface cooler 200, and the evaporator 310 is installed at the outlet end of the second airflow pipe 500. The desorbed hot and humid airflow enters the surface cooler 200 through the first airflow pipe 400 for the first cooling and condensation, and then passes through the second airflow pipe 500 and the evaporator 310 for the second cooling and condensation before being discharged. A return water pipe 600 is also connected between the bottom end of the evaporator 310 and the surface cooler 200. A spiral coil 210 inclined from top to bottom is installed inside the surface cooler 200, and the water inlet end of the spiral coil 210 is connected to the water outlet end of the return water pipe 600. The condenser 330 is installed below the air inlet 110.

[0027] The walls of the adsorption chamber 100 are made of double-layered stainless steel, with a vacuum between the two layers to improve insulation. The airflow outlet of the adsorption chamber 100 is vertically higher than the airflow inlet of the surface cooler 200. The first airflow pipe 400 is installed at an angle between the adsorption chamber 100 and the surface cooler 200. The high-temperature, high-humidity gas desorbed from the adsorption chamber 100 enters the first airflow pipe 400, where it undergoes convective heat exchange with the pipe wall. The pipe wall also exchanges heat with the external environment, which facilitates the cooling and condensation of the high-temperature, high-humidity gas. The water condensed in the first airflow pipe 400 flows into the surface cooler 200 under gravity.

[0028] In some embodiments, please refer to Figure 2 The first gas flow pipe 400 has at least one exhaust window 410 on its wall, and a sealing cap 420 is installed on the exhaust window 410. During the water adsorption process, the sealing cap 420 is opened to allow the interior of the first gas flow pipe 400 to communicate with the external environment, and the adsorbed air can be directly discharged from the exhaust window 410, reducing resistance interference in subsequent channels. During the desorption process, the sealing cap 420 is used to block the exhaust window 410 to collect the moisture in the high-temperature and high-humidity gas formed during desorption. The sealing cap 420 is hinged to the wall of the first gas flow pipe 400.

[0029] In order to improve the internal heat exchange efficiency of the first airflow pipe 400, a number of heat dissipation fins 430 are provided on the outer wall of the first airflow pipe 400 to increase the heat dissipation surface area. The number of heat dissipation fins 430 are evenly distributed on the outer wall of the first airflow pipe 400.

[0030] In some embodiments, the second airflow pipe 500 is installed obliquely between the surface cooler 200 and the evaporator 310, with the airflow outlet end of the surface cooler 200 vertically lower than the airflow outlet end of the second airflow pipe 500. During desorption, the water condensed in the second airflow pipe 500 flows directly into the surface cooler 200 under the influence of gravity. To improve heat dissipation, heat dissipation fins can also be provided on the outer wall of the second airflow pipe 500.

[0031] The return water pipe 600 is installed at an angle between the surface cooler 200 and the evaporator 310, with its inlet end higher than the inlet end of the spiral coil 210. The return water pipe 600 can be installed inside or outside the second airflow pipe 500, as long as its inlet end is higher than the inlet end of the spiral coil 210. During desorption, the condensate formed after heat exchange in the evaporator 310 flows into the spiral coil 210 through the return water pipe 600 under gravity. The spiral coil 210 is located in the surface cooler 200, allowing for heat exchange between the condensate formed after heat exchange in the evaporator 310 and the high-temperature, high-humidity gas.

[0032] The surface cooler 200 is positioned lower than the evaporator 310. A water collection tray 220 is installed at the bottom of the surface cooler 200, and a water tank 700 is installed below the water collection tray 220. The water tank 700 and the water collection tray 220 are connected. The outlet of the spiral coil 210 is connected to the water collection tray 220. To facilitate heat dissipation of the surface cooler 200, several heat dissipation fins can be evenly arranged on the outer wall of the surface cooler. The condensate inside the surface cooler 200 and the condensate in the spiral coil 210 both directly enter the water collection tray 220 and then enter the water tank 700, achieving air-to-water intake.

[0033] In some embodiments, the adsorption box 100 contains multiple adsorption beds 120, each loaded with absorbent material. A mounting mesh plate 130 is installed at the bottom of each adsorption bed 120, fixedly mounted inside the adsorption box 100. The mounting mesh plate 130 has evenly distributed ventilation holes to allow airflow into each adsorption bed 120. A heating layer 140 is installed between the adsorption beds 120 and the mounting mesh plate 130 to heat the adsorption beds 120, causing the adsorbed water in the adsorption beds 120 to desorb and escape from the adsorption beds 120 as water vapor. The heating layer 140 can be a heating film or a heating coil, as long as it can achieve uniform heating of the adsorption beds 120. The absorbent material used in this application is a water-absorbing MOF material, such as MOF-303. A fan 150 is installed at the top of the adsorption box 100, which drives ambient air into the adsorption beds 120. Fan 150 is a stepless speed-regulating fan 150, which can operate at a preset speed during the adsorption and desorption condensation stages.

[0034] To better control the air entering the adsorption chamber 100, an air valve (not shown in the figure) is installed at the air inlet 110 at the bottom of the adsorption chamber 100. Temperature and humidity sensors are installed at the air inlet 110 of the adsorption chamber 100, inside the first airflow pipe 400, inside the second airflow pipe 500, and at the airflow outlet of the evaporator 310.

[0035] The adsorption process of the air-to-water collection device with the pre-cooling structure described above is as follows:

[0036] With the heat pump mechanism 300 shut off, ambient air enters through the air inlet 110 at the bottom of the adsorption chamber 100. Temperature and humidity sensors at the air inlet 110 detect and provide feedback on the air conditions entering the adsorption chamber 100. Driven by the top fan 150, the incoming air flows sequentially through each layer of the adsorption beds 120, where the MOF material continuously absorbs moisture from the air. To improve adsorption efficiency, the air valve at the air inlet 110 is fully opened, and the fan 150 is set to adsorption speed. The adsorption time is automatically controlled based on the air conditions at the air inlet 110 and the material adsorption curve. During this process, the exhaust windows 410 on the wall of the first airflow pipe 400 are fully opened, allowing the adsorbed air to be directly discharged through these exhaust windows 410, reducing resistance interference in subsequent flow channels.

[0037] The desorption and condensation process of the air-to-water collection device with the pre-cooling structure described above is as follows:

[0038] After adsorption is completed, all exhaust windows 410 on the wall of the first airflow pipe 400 are closed. The heat pump mechanism 300 and the fan 150 are turned on first, and the heating function of the heating layer 140 is turned on. The speed of the fan 150 is controlled at 20%, and the opening of the air valve at the air inlet 110 is kept at 100%. Then the heating layer 140 below the adsorption bed 120 is turned on for heating and desorption. After the condenser 330 in the heat pump mechanism 300 dissipates heat, it raises the ambient temperature (taking 30℃ as an example) to about 50℃, preheating the air at the air inlet 110. The preheated air then enters the adsorption bed 120 and is further heated to 100℃ under the action of the heating layer 140. The heating power of the heating layer 140 can be infinitely adjusted. In the first minute before desorption begins, the power of the heating layer 140 is adjusted to the maximum to quickly raise the temperature of the entire adsorption bed 120 space to the desorption temperature. Then, the power of the heating layer 140 is automatically adjusted according to the temperature in the adsorption box 100 to keep the MOF material always within the optimal desorption temperature range.

[0039] The high-temperature and high-humidity gas (100℃ / 50%RH) desorbed from the adsorption bed 120 enters the first airflow pipe 400 under the action of the top fan 150. In the first airflow pipe 400, the high-temperature and high-humidity gas undergoes convective heat exchange with the wall of the first airflow pipe 400, and the outer surface of the wall exchanges heat with the environment. The heat dissipation fins on the outer surface of the wall are used to increase the heat dissipation area and increase the heat dissipation. After the heat exchange with the wall, the humid and hot air condition becomes 95℃ / 60%RH. Then the humid and hot air flows through the surface cooler 200 and enters the second airflow pipe 500. Finally, it enters the evaporator 310 at the end of the channel and condenses water on the surface. Throughout the process, the outlet air temperature of the evaporator 310 is controlled at 8-12℃ and the relative humidity is close to saturation. Too low a temperature will result in excessive energy consumption and noise of the equipment, while too high a temperature is not conducive to condensation and water collection.

[0040] Condensation gradually drips from the surface of evaporator 310, collecting at its bottom. Under gravity, it enters the return water pipe 600, whose outlet connects to the inlet of spiral coil 210. This means the condensate from evaporator 310 is used as cooling water in surface cooler 200. One minute after startup, cooling water is present inside surface cooler 200 at a temperature of approximately 13–18°C, providing significant cooling energy. The condensate flows slowly down the inclined and swirling spiral coil 210 under gravity, exchanging heat effectively with the warm, humid air in surface cooler 200 before finally flowing into the drip tray 220 at a temperature of approximately 45°C. The entire process requires no external force, such as a water pump, making it energy-efficient, simple, and reliable. Simultaneously, the hot and humid air condenses on the surface of the surface cooler 200, and the condensate flows into the water collection tray 220. The air cooled by the surface cooler 200 has an operating condition of 70℃ / 100%RH. This saturated air then enters the evaporator 310 for further condensation, and this process repeats. The air-water collection device of this application utilizes the waste heat of the condenser 330 for preheating and the condensate formed in the evaporator 310 for precooling. Compared with the traditional adsorption-type air-water collection device for cooling and collecting water, it saves more than 50% of energy.

[0041] In this application, a temperature and humidity sensor arranged at the outlet of the evaporator 310 detects the condensate outlet air temperature. The state of air condensation is determined by the outlet air temperature, and then the load of the compressor 320, fan 150 and other components is automatically adjusted to ensure that while meeting the requirement of large water intake, the power consumption is minimized, and the outlet air temperature, i.e. the outlet air humidity, is always controlled within the most reasonable range.

[0042] The above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications and substitutions should be covered within the scope of the claims of this utility model. Technologies, shapes, and structural parts not described in detail in this utility model are all known technologies.

Claims

1. An air water taking device with pre-cooling structure, characterized in that, The device comprises an adsorption box, a surface cooler and a heat pump mechanism, the bottom end of the adsorption box is provided with an air inlet, a first air flow pipe is connected between the air outlet end of the adsorption box and the surface cooler, the heat pump mechanism comprises an evaporator, a compressor, a condenser and an expansion valve connected in sequence, the inlet end of the expansion valve is connected with the condenser, and the outlet end of the expansion valve is connected with the evaporator. A second air flow pipe is connected between the evaporator and the surface cooler, the evaporator is installed at the outlet end of the second air flow pipe, the wet and hot air flow desorbed from the adsorption box enters the surface cooler for the first cooling and condensation, and then passes through the evaporator through the second air flow pipe for the second cooling and condensation and is discharged; a water return pipe is further connected between the bottom end of the evaporator and the surface cooler, a spiral coil pipe inclined from top to bottom is installed in the surface cooler, the water inlet end of the spiral coil pipe is connected with the water outlet end of the water return pipe, and the condenser is installed below the air inlet.

2. The air water device with pre-cooling structure according to claim 1, characterized in that, The air outlet end of the adsorption box is higher than the air inlet end of the surface cooler in the vertical direction, and the first air flow pipe is obliquely installed between the adsorption box and the surface cooler.

3. The air water device with pre-cooling structure according to claim 2, characterized in that, At least one exhaust window is arranged on the pipe wall of the first air flow pipe, and a sealing cover is installed on the exhaust window.

4. The air water device with pre-cooling structure according to claim 2, characterized in that, A plurality of heat dissipation fins are arranged on the outer pipe wall of the first air flow pipe, and the plurality of heat dissipation fins are uniformly distributed on the outer pipe wall of the first air flow pipe.

5. The air water device with pre-cooling structure according to claim 1, characterized in that, The second air flow pipe is obliquely installed between the surface cooler and the evaporator, and the air outlet end of the surface cooler is lower than the air outlet end of the second air flow pipe in the vertical direction.

6. The air water device with pre-cooling structure according to claim 1, characterized in that, The water return pipe is obliquely installed between the surface cooler and the evaporator, and the water inlet end of the water return pipe is higher than the water inlet end of the spiral coil pipe.

7. The air water device with pre-cooling structure according to claim 1, characterized in that, A water collecting tray is installed at the bottom end of the surface cooler, a water tank is installed below the water collecting tray, the water tank and the water collecting tray are communicated, and the water outlet end of the spiral coil pipe is communicated with the water collecting tray.

8. The air water device with pre-cooling structure according to claim 1, characterized in that, A plurality of adsorption beds are installed in the adsorption box, the adsorption beds are loaded with water absorption materials, and a heating layer is installed below the adsorption beds.

9. The air water device with pre-cooling structure according to claim 8, characterized in that, A fan is installed at the top of the adsorption box, and the fan is a stepless speed regulation fan.

10. The air water device with pre-cooling structure according to any one of claims 1-9, characterized in that, A temperature and humidity sensor is installed at the air inlet of the adsorption box, in the first air flow pipe, in the second air flow pipe and at the air outlet end of the evaporator.

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