Water mixing type medium-temperature water preparation system

Abstract

The utility model discloses a water mixing type medium-temperature water preparation system, and relates to the technical field of warm water preparation. The device specifically comprises a water mixer and a power unit, the bottom end of the water mixer is communicated with a liquid inlet and a liquid using equipment outlet, and liquid flowing in from the liquid inlet and the liquid using equipment is mixed; the power unit is arranged on a pipeline between an outlet of the water mixer and an inlet of the liquid using equipment; wherein the water mixer exchanges heat with liquid from the liquid inlet and the liquid using equipment. Liquid flowing in from the liquid inlet and liquid flowing in from the liquid using equipment are collected and mixed through the water mixer, heat exchange is carried out after the liquid is mixed at the bottom of the water mixer, the cold liquid and the hot liquid are mixed more sufficiently, medium-temperature water meeting the requirement of the water using equipment is prepared, and compared with an existing warm water system, the water outlet temperature is more balanced, temperature fluctuation is small, and energy consumption is low. The temperature measurement precision and the temperature control stability are improved, and the utilization rate of the cooling capacity is increased.

Description

Technical Field

[0001] The utility model relates to the technical field of warm water preparation, in particular to a water mixing type medium-temperature water preparation system. Background Art

[0002] Medium-temperature water is increasingly used in modern industrial and commercial buildings. In central air conditioning systems, medium-temperature water systems control indoor temperature and humidity, ensuring that air quality meets specific cleanliness requirements. Industrial process control requires water at a specific temperature to control reaction rates or ensure product quality. In domestic water supply, medium-temperature water systems provide suitable hot water.

[0003] With the widespread application of medium-temperature water, heat exchangers play a major role in the preparation of medium-temperature water. However, the heat recovery rate of the plate heat exchanger with the highest heat exchange efficiency is only about 90%. As long as heat exchange is being performed, heat loss is inevitable. Therefore, people have designed a medium-temperature control system to further improve the heat recovery rate.

[0004] At present, the medium-temperature control system adopts the method of mixing low-temperature water and high-temperature water to directly realize the preparation of medium-temperature water. Specifically, low-temperature water flows from the chilled water main to the power unit, and the dry coil valve group is used to generate high-temperature water. The high-temperature water generated by the dry coil valve flows into the power unit after passing through the check valve. The high-temperature water and low-temperature water are mixed in the power unit to realize the preparation of medium-temperature water.

[0005] After searching the prior art, it was found that there are still some deficiencies in the above technical solution. Since the high-temperature water generated by the dry coil valve group and the chilled water flowing into the chilled water pipe converge in the power device, the high-temperature water and the chilled water realize heat exchange in the pipeline to prepare medium-temperature water. The main function of the power device is to provide power for the flow of water and improve the fluidity of the water in the pipeline. When the high-temperature water and the chilled water are mixed in the power device, due to the limited space of the pipeline and the difference in the water flow rate in the pipeline, the mixing time of the high-temperature water and the chilled water is short. The liquid with a slow flow rate will form vortexes or retention areas in the pipeline, while the liquid with a fast flow rate will pass quickly before or after the mixing point, resulting in a large temperature difference after the medium-temperature water is prepared, which is difficult to apply to medium-temperature water under different temperature requirements.

[0006] Therefore, the present application aims to improve the uniformity and stability of the temperature of medium-temperature water, reduce temperature fluctuations, and improve energy utilization when using a temperature control system to prepare medium-temperature water. Utility Model Content

[0007] The main purpose of the present invention is to provide a method for improving the uniformity and stability of the temperature of medium-temperature water, reducing temperature fluctuations, and improving energy utilization when a temperature control system is used to prepare medium-temperature water.

[0008] In order to achieve the above-mentioned purpose, the utility model proposes a mixed water medium temperature water preparation system, comprising

[0009] a water mixer, the bottom end of which is connected to a liquid inlet and an outlet of a liquid-using device, and mixes the liquids flowing into the liquid inlet and the liquid-using device; and

[0010] A power unit is provided on the pipeline between the outlet of the water mixer and the inlet of the liquid-using equipment;

[0011] The water mixer performs heat exchange between the liquid from the liquid inlet and the liquid-consuming equipment.

[0012] In the above scheme, the liquid inlet and the liquid-using equipment supply liquids with different temperature differences into the water mixer, so that the liquids with different temperature differences between the liquid inlet and the liquid-using equipment realize heat exchange in the water mixer, ensuring that the liquids with different temperature differences are mixed in the water mixer, ensuring the uniformity of the liquid temperature, and the liquid flows in from the bottom end of the water mixer, so that the liquid is mixed for a longer time, ensuring that the liquid flows in from the bottom end of the water mixer, and the evenly mixed liquid flows out from the top end of the water mixer, ensuring that the liquid heat exchange is more balanced.

[0013] Furthermore, the inner wall of the water mixer is provided with a vortex structure for forming a swirling flow of liquid. When chilled water flows into the water mixer, it is impacted by the vortex structure, causing it to flow in a spiral. Simultaneously, hot water flowing into the water mixer from the liquid equipment is also impacted by the vortex structure, causing it to flow in a spiral. The hot water and chilled water are thoroughly mixed and interacted, resulting in a more uniform temperature of the medium-temperature water flowing out of the mixer outlet.

[0014] Furthermore, the inner wall of the water mixer is fixedly mounted with at least one spiral deflector. The deflector is spirally curved on the inner wall of the water mixer, causing the chilled and hot water to form vortices during vortex flow, driven by its own kinetic energy. This achieves mixing of the hot and cold water, and the deflector imparts an axial motion to the liquid, ensuring more complete mixing. The deflector's inclination along the water flow direction maximizes the retention of liquid momentum and prevents kinetic energy loss.

[0015] Furthermore, the inner wall of the water mixer is provided with at least one spiral guide groove. When the chilled water and hot water flow toward the bottom of the water mixer, they vortex through the guide groove and mix thoroughly during the flow, ensuring more complete contact between the cold and hot water during the mixing process and a more uniform temperature of the medium-temperature water produced by the water mixer.

[0016] Furthermore, the bottom of the water mixer is provided with a liquid inlet and a liquid return port, which respectively connect to the liquid inlet and outlet and the outlet of the liquid-using device. The axes of the liquid inlet and the liquid return port are tangential to the inner wall of the water mixer. The arrangement of the liquid inlet and the liquid return port ensures that chilled water and hot water flow tangentially along the inner wall of the water mixer, promoting the generation of vortexes. A liquid outlet is also installed at the top of the water mixer, serving as the outlet for discharging medium-temperature water.

[0017] Furthermore, the pipeline between the water mixer and the power unit is connected to an overflow tank, which receives some of the medium-temperature water from the water mixer. The overflow tank's outlet is connected to a liquid return port via a pipeline, and a second check valve and a flow-limiting orifice plate are installed on the liquid return port pipeline. Producing medium-temperature water by mixing water will cause the water volume in the system to continuously increase. Therefore, a branch line is provided between the water mixer and the power unit to connect to the overflow tank, which feeds excess medium-temperature water into the chilled water return side.

[0018] Furthermore, an airbag is secured to the top of the overflow tank, and a two-way valve with a pressure interlock is coupled to the overflow tank outlet. A remote pressure gauge monitors the airbag pressure, which in turn controls the two-way valve. High-pressure interlocks open the valve, low-pressure interlocks close the valve, and a low-pressure alarm prompts manual air refill, stabilizing pressure.

[0019] Furthermore, a remote differential pressure gauge and a pressure bypass valve are connected in parallel to the outlet and inlet of the liquid-consuming equipment. The pressure bypass valve is coupled to the remote differential pressure gauge and is opened by the pressure differential from the remote differential pressure gauge. The pressure bypass valve controls its opening based on the pressure differential signal from the remote differential pressure gauge. When the load on the liquid-consuming equipment decreases, some of the pressure bypass valves are reduced or closed, causing increased system pressure loss and the reading on the remote differential pressure gauge to increase. The pressure bypass valve, under signal control, opens wider, allowing some liquid to bypass, achieving pressure relief and reducing the pressure differential to the set value.

[0020] Furthermore, a remote temperature sensor and an automatic control valve are coupled to each other at the outlet of the mixer and the pipe leading to the liquid inlet. To ensure stable water supply temperature, the remote temperature sensor monitors the liquid temperature at the outlet. Based on water temperature feedback, the opening of the automatic control valve is controlled in real time to adjust the cooling water flow rate and ensure the required medium-temperature water temperature.

[0021] Furthermore, the power unit includes at least one circulating pump assembly, which includes a centrifugal pump and shut-off valves located on the centrifugal pump's inlet and outlet pipes. Two circulating pump assemblies are provided, namely circulating pump assembly 1 and circulating pump assembly 2, which serve as backup for each other. The circulating pump assembly includes a first shut-off valve, a filter, a centrifugal pump, a one-way valve, and a second shut-off valve, which are connected in sequence. The filter filters the incoming liquid to prevent solid particles from damaging the centrifugal pump.

[0022] The above technical solution has the following advantages:

[0023] The utility model adopts a water mixer to collect and mix the liquid flowing into the liquid inlet and the liquid flowing into the liquid-using equipment, and the liquids are mixed at the bottom of the water mixer to undergo heat exchange, so that the cold and hot liquids are mixed more fully, and medium-temperature water that meets the needs of the water-using equipment is produced, that is, the use of a plate heat exchanger is avoided. At the same time, the outlet water temperature is more balanced than that of the existing medium-temperature water system, and the temperature fluctuation is small, which is conducive to improving the temperature measurement accuracy and the stability of temperature control, improving the utilization rate of the cooling capacity, and effectively solving the problems of energy consumption and efficiency attenuation of the heat exchanger, which is environmentally friendly and energy-saving.

[0024] The liquid flows in along the tangential direction of the inner wall of the mixer and forms a vortex with the cooperation of the vortex structure. Under the action of the guide plate, the liquid has an additional vertical movement trend, so that the cold and hot liquids are mixed more fully.

[0025] An overflow tank is installed in the mixer outlet pipeline to effectively balance the water volume in the medium-temperature water system. The overflow tank outlet features a normal flow-restricting orifice plate and a rapid overflow channel at the two-way valve. These two channels effectively ensure a stable overflow volume per unit time. This effectively controls the impact of the direct-mix medium-temperature water preparation system on the chilled water system and chillers in terms of both temperature and flow rate, effectively improving the temperature control accuracy and operational stability of the medium-temperature water preparation system. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention will be described in detail below with reference to specific embodiments and accompanying drawings, wherein:

[0027] Figure 1 This is the overall pipeline wiring diagram of the utility model;

[0028] Figure 2 This is a schematic structural diagram of the water mixer of the utility model;

[0029] Figure 3 This is a cross-sectional structural diagram of the water mixer of the utility model;

[0030] Figure 4 This is the pipeline wiring diagram of the power unit of the utility model.

[0031] In the figure: 1. Remote temperature gauge; 2. Water mixer; 3. Automatic control valve; 4. Check valve 1; 5. Liquid inlet; 6. Remote pressure gauge; 7. Compressed air inlet; 8. Air bag; 9. Two-way valve; 10. Liquid return port; 11. Check valve 2; 12. Flow limiting orifice; 13. Overflow tank; 14. Power unit; 15. Liquid-using equipment; 16. Remote differential pressure gauge; 17. Pressure differential bypass valve; 18. Check valve 3; 19. Circulating pump group 1; 20. Circulating pump group 2; 21. Local pressure gauge; 22. Filter; 23. Centrifugal pump; 24. Stop valve 1; 25. Drain valve; 26. One-way valve; 27. Stop valve 2; 28. Liquid outlet; 29. ​​Guide plate; 30. Liquid inlet; 31. Liquid return port. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the following specific embodiments are only used to explain the present invention and do not constitute a limitation to the present invention.

[0033] like Figure 1 As shown, a water mixing type medium-temperature water preparation system includes a water mixer 2 and a power unit 14. The bottom end of the water mixer 2 is connected to a liquid inlet 5 and an outlet of a liquid-consuming device 15, and the power unit 14 mixes the liquids flowing in from the liquid inlet 5 and the liquid-consuming device 15. The power unit 14 is installed in the pipeline between the outlet of the water mixer 2 and the inlet of the liquid-consuming device 15. The water mixer 2 performs heat exchange on the liquids from the liquid inlet 5 and the liquid-consuming device 15. The liquid inlet 5 and the liquid-consuming device 15 supply liquids of different temperatures into the water mixer 2, enabling heat exchange between the liquids from the liquid inlet 5 and the liquid-consuming device 15 within the water mixer 2. This ensures that the liquids of different temperatures are mixed within the water mixer 2 and that the liquid temperatures are uniform. Liquid flows from the bottom end of the water mixer 2, allowing the liquids to mix longer, ensuring that the liquids flow in from the bottom end and flow out from the top end of the water mixer 2, ensuring more balanced heat exchange. The liquid can be industrial water, softened water, purified water, recycled water, etc., and can be selected according to different usage scenarios.

[0034] As one implementation in this embodiment, in this application, taking a central air conditioning system as an example, chilled water is introduced into the liquid inlet 5. The water temperature of the water flowing from the liquid device 15 to the water mixer 2 is higher than that of the chilled water. A check valve 4 is also provided on the pipeline of the liquid inlet 5 to prevent the chilled water from flowing back into the water mixer 2. The power unit 14 can be a centrifugal pump 23, a gear pump, a jet pump, a magnetic pump, or the like, all of which can increase the flow rate of the liquid in the pipeline. In this application, a centrifugal pump 23 is used.

[0035] As an implementation method in this embodiment, Figure 1 and Figure 2As shown, the inner wall of the water mixer 2 is provided with a vortex structure for forming the liquid into a vortex flow, wherein the chilled water flows into the water mixer 2, and the chilled water is subjected to the collision of the vortex structure to flow in a spiral shape. At the same time, the hot water flowing into the water mixer 2 by the liquid device 15 is also subjected to the collision of the vortex structure to flow in a spiral shape. The hot water and the chilled water are fully mixed and interacted, so that the temperature of the medium-temperature water flowing out of the outlet of the water mixer 2 is more balanced.

[0036] Example 1:

[0037] At least one spiral deflector 29 is fixedly mounted on the inner wall of the mixer 2. This spiral curves the chilled and hot water, creating a vortex driven by its own kinetic energy during the swirling flow. This mixes the hot and cold water, and the deflector 29 imparts axial motion to the liquids, ensuring more complete mixing. The inclination of the deflector 29 along the flow direction maximizes the retention of liquid momentum and prevents kinetic energy loss.

[0038] Example 2:

[0039] At least one spiral guide groove is provided on the inner wall of the water mixer 2. When the chilled water and hot water flow to the bottom of the water mixer 2, the chilled water and hot water flow in a vortex shape through the guide groove and are fully mixed during the flow, ensuring that the cold and hot water are in more complete contact during the mixing process and that the temperature of the medium-temperature water produced by the water mixer 2 is more balanced.

[0040] like Figure 1 and Figure 2 As shown, based on the above two embodiments, the bottom of the water mixer 2 is provided with a liquid inlet 30 and a liquid return port 31, which respectively connect to the outlet of the liquid inlet 5 and the outlet of the liquid-using device 15. The axes of the liquid inlet 30 and the liquid return port 31 are tangential to the inner wall of the water mixer 2. The arrangement of the liquid inlet 30 and the liquid return port 31 ensures that the chilled water and hot water flow tangentially along the inner wall of the water mixer 2, promoting the generation of vortexes. The top of the water mixer 2 is also provided with a liquid outlet 28, which serves as the outlet of the water mixer 2 and is used to discharge medium-temperature water.

[0041] like Figure 1 As shown, the pipeline between the water mixer 2 and the power unit 14 is also connected to the overflow tank 13, and part of the medium-temperature water from the water mixer 2 flows into the overflow tank 13, wherein the outlet of the overflow tank 13 is connected to the liquid return port 10 through a pipeline, and a check valve 11 and a flow limiting orifice 12 are provided on the pipeline of the liquid return port 10. The production of medium-temperature water by mixing water will cause the water volume in the system to continue to increase. Therefore, a branch is set between the water mixer 2 and the power unit 14 to connect the overflow tank 13, and the excess medium-temperature water is sent to the chilled water return side.

[0042] A gas bag 8 is secured to the top of the overflow tank 13. A two-way valve 9, with a pressure interlock, is coupled to the outlet of the overflow tank 13. As the liquid in the tank increases, it compresses the gas bag 8, causing the pressure to increase. Conversely, as the gas bag 8 expands, the pressure decreases. Liquid in the overflow tank 13 is continuously discharged through the flow-restricting orifice 12. However, due to the fluctuating energy consumption of the load of the liquid-consuming equipment 15, the chilled water input can increase within a short period of time, causing the overflow volume to exceed the flow rate permitted by the flow-restricting orifice 12. In this situation, a large amount of liquid accumulates in the overflow tank 13, increasing the pressure in the gas bag 8. To address this issue, a remote pressure gauge 6 is installed to monitor the pressure in the gas bag 8. This remote pressure gauge 6 controls the two-way valve 9 and is equipped with a high-pressure interlock to open the valve, a low-pressure interlock to close the valve, and a low-pressure alarm to prompt manual air replenishment. The low-pressure alarm is defined by two set pressure values, A and B. When the pressure falls below A, the valve is closed, known as the low interlock. If the pressure drops further to value B, a signal is triggered again, known as the low-low alarm. The liquid flowing out of the overflow tank 13 from the liquid return port 10 flows out through the two-way valve 9 and the flow-limiting orifice 12. As the system overflow volume decreases, the liquid level in the overflow tank 13 drops, the pressure on the airbag 8 gradually decreases, and the two-way valve 9 is gradually closed through the remote pressure gauge 6, which also stabilizes the pressure of the liquid in the overflow tank 13. When replenishing air, the compressed air inlet 7 located at the top of the overflow tank 13 is manually opened. The valve at the compressed air inlet 7 replenishes the gas leaked from the airbag 8 due to long-term operation.

[0043] As an implementation method in this embodiment, Figure 1 As shown, the pipeline between the liquid-consuming device 15 and the water mixer 2 is further provided with a check valve 3 18 to prevent hot water from flowing back into the liquid-consuming device 15. A remote differential pressure gauge 16 and a pressure differential bypass valve 17 are also connected in parallel to the outlet and inlet of the liquid-consuming device 15. The pressure differential bypass valve 17 is coupled to the remote differential pressure gauge 16 and is opened by the pressure differential of the remote differential pressure gauge 16. The remote differential pressure gauge 16 and the pressure differential bypass valve 17 are connected in parallel between the inlet and outlet manifolds of the liquid-consuming device 15. The pressure differential bypass valve 17 controls its valve opening based on the pressure differential signal from the remote differential pressure gauge 16. When the load of the liquid-consuming equipment 15 decreases, part of the valve of the pressure differential bypass valve 17 will be reduced or closed, resulting in an increase in system pressure loss, an increase in the reading of the remote pressure differential gauge 16, and an increase in the opening of the pressure differential bypass valve 17 under signal control, allowing part of the liquid to pass through along the bypass, achieving the purpose of pressure relief, and the pressure differential is reduced to the set value; when the load of the liquid-consuming equipment 15 increases, the reading of the remote pressure differential gauge 16 decreases, and the opening of the pressure differential bypass valve 17 is reduced or closed under signal control, the bypass flow is reduced, the medium-temperature water sent to the liquid-consuming equipment 15 increases, the pressure differential is increased, and the required pressure differential set value is maintained.

[0044] like Figure 1As shown, a remote thermometer 1 and an automatic control valve 3 are coupled to each other at the outlet of the mixer 2 and the liquid inlet 5 leading to the mixer 2. To ensure stable water supply temperature, the remote thermometer 1 monitors the liquid temperature at the liquid outlet 28. Based on water temperature feedback, the opening of the automatic control valve 3 is controlled in real time to adjust the cooling water flow rate to ensure that the required medium-temperature water temperature is met.

[0045] like Figure 3 As shown, the power unit 14 includes at least one circulating pump group, which includes a centrifugal pump 23 and stop valves provided on the inlet and outlet pipes of the centrifugal pump 23. In the present application, two circulating pump groups are provided, namely circulating pump group 1 19 and circulating pump group 2 20, which serve as backup for each other. The circulating pump groups include stop valve 1 24, filter 22, centrifugal pump 23, one-way valve 26, and stop valve 2 27, which are connected in sequence.

[0046] During operation, open the stop valve 1 24 to introduce medium-temperature water into the centrifugal pump 23, fill the pump to exhaust the gas in the pump, then open the centrifugal pump 23 to build pressure, and slowly open the stop valve 2 27 until the designed flow and head are reached. The pre-filter 22 of the centrifugal pump 23 filters the liquid entering the pump to prevent solid particles from damaging the centrifugal pump 23. In order to prevent backflow problems caused by pump shutdown or other reasons, a one-way valve 26 is set behind the centrifugal pump 23. On-site pressure gauges 21 are set before and after the filter 22 and at the outlet of the centrifugal pump 23 to monitor the status of the filter 22 and the head of the centrifugal pump 23. Taking into account the sewage discharge problem when replacing the filter element and overhauling the pump, a branch with a drain valve 25 is provided between the filter 22 and the centrifugal pump 23 to facilitate overhaul and maintenance.

[0047] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention specification and drawings under the utility model concept, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A mixed water medium temperature water preparation system, characterized in that: include: A water mixer (2), the bottom end of which is connected to a liquid inlet (5) and an outlet of a liquid-using device (15), and mixes the liquids flowing into the liquid inlet (5) and the liquid-using device (15); and A power unit (14) is provided on a pipeline between the outlet of the water mixer (2) and the inlet of the liquid-using device (15); The water mixer (2) performs heat exchange between the liquid from the liquid inlet (5) and the liquid-using device (15).

2. The mixed water medium temperature water preparation system according to claim 1, characterized in that: The inner wall of the water mixer (2) is provided with a vortex structure for causing the liquid to flow in a vortex shape.

3. The mixed water medium temperature water preparation system according to claim 2, characterized in that: At least one spiral guide plate (29) is fixedly mounted on the inner wall of the water mixer (2).

4. The mixed water medium temperature water preparation system according to claim 2, characterized in that: The inner wall of the water mixer (2) is provided with at least one spiral guide groove.

5. The mixed water medium temperature water preparation system according to claim 2, 3 or 4, characterized in that: The bottom of the water mixer (2) is provided with a liquid inlet (30) and a liquid return port (31) which are connected to the liquid inlet (5) and the liquid-using device (15) respectively. The axes of the liquid inlet (30) and the liquid return port (31) are tangent to the inner wall of the water mixer (2).

6. The mixed water medium temperature water preparation system according to claim 1, characterized in that: The pipeline between the water mixer (2) and the power unit (14) is also connected to an overflow tank (13), and part of the medium-temperature water from the water mixer (2) flows into the overflow tank (13).

7. The mixed water medium temperature water preparation system according to claim 6, characterized in that: An air bag (8) is fixed on the top of the overflow tank (13), and the air bag (8) is coupled to a two-way valve (9) with pressure interlock opening at the outlet of the overflow tank (13).

8. The mixed water medium temperature water preparation system according to claim 1, characterized in that: The outlet and inlet of the liquid-using device (15) are also connected in parallel with a remote pressure differential meter (16) and a pressure differential bypass valve (17). The pressure differential bypass valve (17) is coupled to the remote pressure differential meter (16) and is opened by the pressure difference of the remote pressure differential meter (16).

9. The mixed water medium temperature water preparation system according to claim 1, characterized in that: A remote temperature meter (1) and an automatic control valve (3) coupled to each other are respectively provided on the outlet of the water mixer (2) and the pipeline from the liquid inlet (5) flowing to the water mixer (2).

10. The mixed water medium temperature water preparation system according to claim 1, characterized in that: The power unit (14) comprises at least one circulating pump group, and the circulating pump group comprises a centrifugal pump (23) and stop valves provided on an inlet pipeline and an outlet pipeline of the centrifugal pump (23).

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