Central air conditioning chilled water large temperature difference heat exchange terminal device

Abstract

The utility model discloses a central air conditioning chilled water big temperature difference heat exchange terminal device, including water chiller unit and plate heat exchanger, the water outlet end and water inlet end of water chiller unit all have the pipeline communication, the right side of water chiller unit is provided with the installation box, the inside of installation box is provided with two cavities, two the right -hand ends of pipeline are linked with two cavities respectively, two the inside fixedly connected with filter board of cavity, two the inner wall of cavity all has the horizontal pipe communication. The utility model, before cold water is input to the inside of indoor fan -coil, cold water will with the heat exchange of the water of reflux in plate heat exchanger, make the temperature of cold water that is input to fan -coil rise, the cold water of a little temperature rise is passed through the heat exchange of fan -coil, and the temperature will rise again, and then effectively increase the temperature difference of chilled water supply return water, effectively reduce the energy consumption of central air conditioning.

Description

Technical Field

[0001] This utility model relates to the field of central air conditioning technology, and more specifically, to a central air conditioning chilled water large temperature difference heat exchange terminal device. Background Technology

[0002] The central air conditioning chilled water large temperature difference heat exchange terminal device is an air handling equipment specially designed for large temperature difference chilled water systems. It can adapt to air conditioning systems where the temperature difference between chilled water supply and return water is greater than 5℃ (usually up to 8-15℃).

[0003] In common central air conditioning systems, chilled water circulates directly between the chiller unit and the indoor fan coil unit through pipes. The temperature difference between the chilled water supply and return is small, resulting in high energy consumption for central air conditioning. Moreover, over time, particulate matter (rust, welding slag, pipe impurities, etc.) accumulates in the pipes, which can affect heat transfer efficiency and damage the equipment. Therefore, a central air conditioning chilled water large temperature difference heat exchange terminal device is needed. Utility Model Content

[0004] In view of the problems existing in the prior art, the purpose of this utility model is to provide a central air conditioning chilled water large temperature difference heat exchange terminal device.

[0005] To solve the above problems, the present invention adopts the following technical solution;

[0006] A central air conditioning chilled water large temperature difference heat exchange terminal device includes a chiller unit and a plate heat exchanger. The chiller unit has conduits connecting its outlet and inlet ends. An installation box is located on the right side of the chiller unit. The installation box contains two cavities. The right ends of the two conduits are connected to the two cavities respectively. Filter plates are fixedly connected inside each of the two cavities. Horizontal pipes connect the inner walls of both cavities. The right ends of the two horizontal pipes are connected to the plate heat exchanger. A chilled water pipe and a return water pipe are connected to the right side of the plate heat exchanger. Electric actuators are installed on both conduits. The first solenoid valve is mounted on the front of the mounting box, and a controller is installed on the front and back of the mounting box. Two three-way pipes are provided on both the front and back of the mounting box. The two ends of the two three-way pipes near the mounting box pass through the mounting box and are connected to the two cavities respectively. The two ends of the front of the back three-way pipe are located on the right side of the top filter plate and the left side of the bottom filter plate, respectively. The two ends of the back of the front three-way pipe are located on the left side of the top filter plate and the right side of the bottom filter plate, respectively. Solenoid valves are installed on opposite ends of the two three-way pipes. The output of the controller is connected to the two solenoid valves and the two solenoid valves respectively.

[0007] As a further description of the above technical solution:

[0008] Two pressure sensors are installed on the inner walls of both cavities. The four pressure sensors are located on the left and right sides of the two filter plates, respectively. A comparison module is installed on the front of the mounting box. The output terminals of the four pressure sensors are all connected to the comparison module, and the output terminal of the comparison module is connected to the controller.

[0009] As a further description of the above technical solution:

[0010] The installation box has a medicine chamber inside, and the inner wall of the medicine chamber is connected to a dosing pipe. The bottom end of the dosing pipe passes through the installation box and is connected to the inner wall of the top cavity. A metering pump and a one-way valve are installed on the dosing pipe, and the input end of the metering pump is connected to the controller signal.

[0011] As a further description of the above technical solution:

[0012] A water quality sensor is installed on the inner wall of the bottom horizontal tube, and the output terminal of the water quality sensor is connected to the controller signal.

[0013] As a further description of the above technical solution:

[0014] A liquid level sensor is installed on the inner wall of the medicine chamber, and a buzzer is installed on the front of the mounting box. The output terminal of the liquid level sensor is connected to the buzzer signal.

[0015] Compared with existing technologies, the advantages of this utility model are:

[0016] Before the chilled water is introduced into the indoor fan coil unit, it exchanges heat with the return water in a plate heat exchanger. This raises the temperature of the chilled water entering the fan coil unit. After passing through the fan coil unit, the temperature of the slightly warmer chilled water rises again, effectively increasing the temperature difference between the chilled water supply and return, and thus reducing the energy consumption of the central air conditioning system. Before the chilled water enters the plate heat exchanger, and before the return water returns to the chiller unit, the water passes through two filter plates. These filter plates effectively remove particulate matter from the water, thereby improving heat transfer efficiency and reducing damage to pipes and equipment caused by particulate matter, thus enhancing the practicality of the system. Attached Figure Description

[0017] Figure 1 One of the perspective views of this utility model;

[0018] Figure 2 This is a second perspective view of the present utility model;

[0019] Figure 3 This is a third perspective view of the present utility model;

[0020] Figure 4This is a partial sectional view of the present invention.

[0021] Explanation of the labels in the diagram:

[0022] 1. Chiller unit; 2. Plate heat exchanger; 3. Pipe; 4. Mounting box; 5. Chamber; 6. Filter plate; 7. Horizontal pipe; 8. Cold water pipe; 9. Return water pipe; 10. Pressure sensor; 11. Solenoid valve one; 12. Controller; 13. Comparison module; 14. T-connector; 15. Solenoid valve two; 16. Chemical chamber; 17. Dosing pipe; 18. Metering pump; 19. Check valve; 20. Water quality sensor; 21. Liquid level sensor; 22. Buzzer. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model;

[0024] To increase the temperature difference between chilled water supply and return water and reduce the energy consumption of central air conditioning, this solution provides Example 1:

[0025] Please see Figures 1-4 This utility model discloses a central air conditioning chilled water large temperature difference heat exchange terminal device, comprising a chiller unit 1 and a plate heat exchanger 2. The outlet and inlet of the chiller unit 1 are both connected to conduits 3. An installation box 4 is located on the right side of the chiller unit 1. The installation box 4 has two cavities 5 inside. The right ends of the two conduits 3 are respectively connected to the two cavities 5. Filter plates 6 are fixedly connected inside each of the two cavities 5. Horizontal pipes 7 are connected to the inner walls of each of the two cavities 5. The right ends of the two horizontal pipes 7 are connected to the plate heat exchanger 2. A chilled water pipe 8 and a return water pipe 9 are connected to the right side of the plate heat exchanger 2. Solenoid valves 1 are installed on both conduits 3. 1. A controller 12 is installed on the front of the mounting box 4. Two three-way pipes 14 are provided on both the front and back of the mounting box 4. The two ends of the two three-way pipes 14 near the mounting box 4 pass through the mounting box 4 and are connected to the two cavities 5 respectively. The two ends of the front of the back three-way pipe 14 are located on the right side of the top filter plate 6 and the left side of the bottom filter plate 6 respectively. The two ends of the back of the front three-way pipe 14 are located on the left side of the top filter plate 6 and the right side of the bottom filter plate 6 respectively. Solenoid valve 2 15 is installed at the opposite ends of the two three-way pipes 14. The output end of the controller 12 is connected to the two solenoid valves 11 and 15 respectively.

[0026] In this invention, during use, the chiller unit 1 outputs chilled water, which enters the top cavity 5 from the top conduit 3. The chilled water then enters the plate heat exchanger 2 from the top horizontal pipe 7, flows from the plate heat exchanger 2 into the chilled water pipe 8, and then flows into the indoor fan coil unit. The fan coil unit carries the cooling energy of the chilled water into the room, raising its temperature. The heated chilled water then enters the plate heat exchanger 2 from the return water pipe 9, and then the return water enters the bottom cavity 5 from the bottom horizontal pipe 7. Finally, it flows back to the chiller unit 1 through the bottom conduit 3, thus completing the water circulation and achieving the effect of cooling the room.

[0027] Before the chilled water is introduced into the indoor fan coil unit, it exchanges heat with the return water in the plate heat exchanger 2, which raises the temperature of the chilled water introduced into the fan coil unit. After the chilled water with a slightly higher temperature passes through the fan coil unit for heat exchange, its temperature will rise again, thereby effectively increasing the temperature difference between the chilled water supply and return water and effectively reducing the energy consumption of the central air conditioning.

[0028] To address the issue of particulate matter in circulating water affecting heat exchange efficiency and equipment lifespan, this solution provides Example 2:

[0029] Before the chilled water enters the plate heat exchanger 2, and before the return water returns to the chiller unit 1, the water passes through two filter plates 6 respectively. The filter plates 6 can effectively filter out particulate matter in the water, thereby effectively improving the heat transfer efficiency and reducing the damage of particulate matter to pipes and equipment, thus improving the practicality of the device.

[0030] After prolonged use, a large amount of particulate matter will accumulate on the left side of the top filter plate 6 and the right side of the bottom filter plate 6, affecting the flow of circulating water and consequently impacting the cooling effect and the lifespan of equipment such as water pumps. To address this issue, this solution provides Embodiment 3:

[0031] When the filter plate 6 needs cleaning due to the accumulation of particulate matter after a period of use, first turn off the central air conditioning and simultaneously close both solenoid valves 11. Then, open both solenoid valves 15. Connect one end of the back of the three-way pipe 14 to the cleaning fluid pipe and the front end of the front three-way pipe 14 to the wastewater pipe. The water pump injects the cleaning fluid into the two chambers 5. The cleaning fluid will flow backward through the two filter plates 6 and then drain into the wastewater pipe from the front three-way pipe 14. During the backward flow of the cleaning fluid through the filter plates 6, the filter plates 6 can be backflushed and cleaned. At the same time, the chambers 5 can also be cleaned. After cleaning, close both solenoid valves 15 and open both solenoid valves 11 to turn the central air conditioning back on.

[0032] Manually cleaning the filter plate 6 periodically incurs certain labor costs. To reduce these costs, this solution provides Example 4:

[0033] Please see Figure 1 and 4 The inner walls of the two chambers 5 are each equipped with two pressure sensors 10. The four pressure sensors 10 are located on the left and right sides of the two filter plates 6 respectively. The front of the mounting box 4 is equipped with a comparison module 13. The output terminals of the four pressure sensors 10 are all connected to the comparison module 13. The output terminal of the comparison module 13 is connected to the controller 12.

[0034] In this invention, two pressure sensors 10 are installed in the same cavity 5, and the two pressure sensors 10 are respectively installed on the left and right sides of the filter plate 6. They can detect the water pressure on the left and right sides of the filter plate 6. The comparison module 13 will calculate the difference between the values ​​detected by the two pressure sensors 10 in the same cavity 5 in real time. When a difference is detected, it indicates that there is a certain blockage in the filter plate 6, and water cannot pass through the filter plate 6 smoothly. A pressure difference will appear on the left and right sides of the filter plate 6. When the detected difference exceeds the threshold, the particles on the surface of the filter plate 6 will seriously affect the normal flow of cold water and need to be cleaned in time. The comparison module 13 will send a cleaning command to the controller 12. After receiving the command, the controller 12 will run the cleaning process of the filter plate 6 according to the preset program. This process is the same as the cleaning process of the filter plate 6 in Embodiment 3 above.

[0035] Filter plate 6 can only mechanically filter out particulate matter in the water, but it cannot remove scale generated in the pipes and heat exchangers. This scale will affect the heat exchange efficiency and also cause damage to the equipment. To solve this problem, this solution provides embodiment five:

[0036] Please see Figure 4 The installation box 4 has a medicine chamber 16 inside, and the inner wall of the medicine chamber 16 is connected to the medicine dosing pipe 17. The bottom end of the medicine dosing pipe 17 passes through the installation box 4 and is connected to the inner wall of the top cavity 5. A metering pump 18 and a one-way valve 19 are installed on the medicine dosing pipe 17. The input end of the metering pump 18 is connected to the controller 12.

[0037] In this invention, scale will appear in pipes and equipment during long-term use. The user can inject the organic phosphonic acid descaling agent in the chemical chamber 16 into the chamber 5 through the dosing pipe 17 by turning on the metering pump 18. The flow of the chemical solution can achieve the effect of descaling pipes and equipment.

[0038] Please see Figures 1-4 The bottom horizontal tube 7 has a water quality sensor 20 installed on its inner wall, and the output of the water quality sensor 20 is connected to the controller 12.

[0039] In this invention, the water quality sensor 20 can detect the water quality of circulating water and determine the signs of scale formation through the water quality. When the water quality reaches a level where scale is easily formed, the water quality sensor 20 will send a scale generation signal to the controller 12, and the controller 12 will run a scale removal process, which is the same as the scale removal process in Embodiment 5.

[0040] Please see Figure 1 and 4 The liquid level sensor 21 is installed on the inner wall of the medicine chamber 16, and a buzzer 22 is installed on the front of the mounting box 4. The output end of the liquid level sensor 21 is connected to the buzzer 22.

[0041] In this invention, the liquid level sensor 21 can detect the amount of organic phosphonic acid descaling agent. When it is about to run out, the liquid level sensor 21 will trigger the buzzer 22 to provide workers with the information to replenish the agent as soon as possible.

[0042] The above are merely preferred embodiments of this utility model; however, the scope of protection of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this utility model, based on the technical solution and its improved concept, should be included within the scope of protection of this utility model.

Claims

1. A central air conditioning chilled water large temperature difference heat exchange terminal device, comprising a chiller unit (1) and a plate heat exchanger (2), characterized in that: The water chiller unit (1) has a conduit (3) connecting its outlet and inlet. A mounting box (4) is located on the right side of the water chiller unit (1). The mounting box (4) has two cavities (5) inside. The right ends of the two conduits (3) are connected to the two cavities (5) respectively. Filter plates (6) are fixedly connected inside the two cavities (5). Horizontal pipes (7) are connected to the inner walls of the two cavities (5). The right ends of the two horizontal pipes (7) are connected to the plate heat exchanger (2). The right side of the plate heat exchanger (2) is connected to a cold water pipe (8) and a return water pipe (9). Solenoid valves (11) are installed on the two conduits (3). A controller is installed on the front of the mounting box (4). (12) The front and back of the mounting box (4) are provided with two three-way pipes (14). The two ends of the two three-way pipes (14) near the mounting box (4) pass through the mounting box (4) and are connected to the two cavities (5) respectively. The two ends of the front of the three-way pipe (14) on the back are located on the right side of the top filter plate (6) and the left side of the bottom filter plate (6) respectively. The two ends of the back of the three-way pipe (14) on the front are located on the left side of the top filter plate (6) and the right side of the bottom filter plate (6) respectively. Solenoid valve two (15) is installed at the opposite ends of the two three-way pipes (14). The output end of the controller (12) is connected to the two solenoid valves one (11) and two solenoid valves two (15) respectively.

2. The central air conditioning chilled water large temperature difference heat exchange terminal device according to claim 1, characterized in that: Two pressure sensors (10) are installed on the inner walls of the two cavities (5). The four pressure sensors (10) are located on the left and right sides of the two filter plates (6). A comparison module (13) is installed on the front of the mounting box (4). The output terminals of the four pressure sensors (10) are connected to the comparison module (13) and the output terminal of the comparison module (13) is connected to the controller (12).

3. The central air conditioning chilled water large temperature difference heat exchange terminal device according to claim 1, characterized in that: The installation box (4) has a medicine chamber (16) inside. The inner wall of the medicine chamber (16) is connected to a dosing pipe (17). The bottom end of the dosing pipe (17) passes through the installation box (4) and is connected to the inner wall of the top cavity (5). A metering pump (18) and a one-way valve (19) are installed on the dosing pipe (17). The input end of the metering pump (18) is connected to the controller (12) via a signal.

4. A central air conditioning chilled water large temperature difference heat exchange terminal device according to claim 1, characterized in that: A water quality sensor (20) is installed on the inner wall of the bottom horizontal tube (7), and the output end of the water quality sensor (20) is connected to the controller (12) via signal.

5. A central air conditioning chilled water large temperature difference heat exchange terminal device according to claim 3, characterized in that: A liquid level sensor (21) is installed on the inner wall of the medicine chamber (16), and a buzzer (22) is installed on the front of the mounting box (4). The output end of the liquid level sensor (21) is connected to the buzzer (22) for signal transmission.

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