A hot water reuse control system

Abstract

The present invention relates to a hot water reuse control system, which includes a control mechanism and a water tank; the water tank is provided with a water inlet pipe and a water outlet pipe, and the water inlet pipe is used to recycle the surplus hot water into the water tank; a water pump is arranged at the bottom of the water tank, and the water outlet of the water pump is communicated with the water outlet pipe for sending the heated surplus hot water to users; an electric heating pipe, a first temperature sensor and a second temperature sensor are arranged in the water tank; the first temperature sensor is used to detect the temperature of the electric heating pipe, and the second temperature sensor is used to detect the temperature of the surplus hot water in the water tank; the electric heating pipe, the first temperature sensor and the second temperature sensor are all electrically connected to the control mechanism; the present invention controls the water temperature by means of a double-loop PID regulation method. Among them, the water temperature is used as the feedback quantity of the outer-loop control, and the temperature of the electric heating pipe is used as the feedback quantity of the inner-loop control, which is more conducive to keeping the temperature of the surplus hot water in the water tank stable and realizing the stable control of the water temperature.

Description

Technical Field

[0001] The present invention relates to the technical field of hot water reuse, and particularly to a hot water reuse control system. Background Art

[0002] At present, for the vast majority of unit heat dissipation, there is no reuse. By connecting through this module, the waste heat of the equipment can be reused to achieve the purpose of energy conservation and emission reduction. This template is highly integrated with built-in heating interfaces, waste heat access ports, output control ports such as circulation pumps, etc. Summary of the Invention

[0003] Based on the above description, the present invention provides a hot water reuse control system, which controls the water temperature through a dual-loop PID regulation method, which is more conducive to keeping the temperature of the remaining hot water in the water tank stable and realizing the stable control of the water temperature.

[0004] The technical solution of the present invention to solve the above technical problems is as follows: A hot water reuse control system includes a control mechanism and a water tank; the water tank is provided with a water inlet pipe and a water outlet pipe, and the water inlet pipe is used to recycle the remaining hot water into the water tank; a water pump is arranged at the bottom of the water tank, and the water outlet of the water pump is communicated with the water outlet pipe for sending the heated remaining hot water to users;

[0005] An electric heating pipe, a first temperature sensor and a second temperature sensor are arranged in the water tank; the first temperature sensor is used to detect the temperature of the electric heating pipe, and the second temperature sensor is used to detect the temperature of the remaining hot water in the water tank; the electric heating pipe, the first temperature sensor and the second temperature sensor are all electrically connected to the control mechanism.

[0006] On the basis of the above technical solution, the present invention can also be improved as follows.

[0007] Further, the control mechanism includes a main comparator, a main PID arithmetic unit, a sub-comparator, a sub-PID arithmetic unit and a temperature controller;

[0008] The input end of the main comparator is used to receive a predetermined water temperature signal, and the second temperature sensor is connected to the feedback end of the main comparator. The output end of the main comparator is connected to the input end of the main PID arithmetic unit, and the output end of the main PID arithmetic unit outputs the given temperature of the electric heating pipe and is connected to the input end of the sub-comparator;

[0009] The first temperature sensor is connected to the feedback end of the sub-comparator, and the output end of the sub-comparator is connected to the input end of the sub-PID arithmetic unit; the output end of the sub-PID arithmetic unit is connected to the temperature controller, and the output end of the temperature controller is connected to the electric heating pipe.

[0010] Further, the second temperature sensor is disposed at the water inlet of the water pump.

[0011] Further, a liquid level probe is disposed in the water tank, and the liquid level probe is used to detect the water level height of the surplus hot water in the water tank; the liquid level probe and the water pump are both electrically connected to the control mechanism.

[0012] Further, the control mechanism includes a third comparator and a liquid level controller. The input end of the third comparator is used to receive a predetermined liquid level signal. The liquid level probe is connected to the input end of the third comparator. The output end of the third comparator is connected to the liquid level controller, and the output end of the liquid level controller is connected to the liquid level water pump.

[0013] Further, a control box is disposed above the water tank. The control mechanism is installed in the control box, and a control panel is disposed on the outer side wall of the control box. The control panel is electrically connected to the control mechanism.

[0014] Further, a display screen, a liquid level adjustment button, and a water temperature adjustment button are disposed on the control panel.

[0015] Further, a heat insulation and leakage prevention plate is disposed between the water tank and the control box.

[0016] Further, a pressure relief valve is disposed on the upper part of the side wall of the water tank.

[0017] Compared with the prior art, the technical solution of the present application has the following beneficial technical effects:

[0018] 1. The present invention controls the water temperature by a double-loop PID regulation method, uses the water temperature as the feedback quantity of the outer-loop control, and uses the temperature of the electric heating tube as the feedback quantity of the inner-loop control, which is more conducive to keeping the surplus hot water in the water tank at a stable temperature and realizing the stable control of the water temperature;

[0019] 2. By integrating the water tank, the temperature controller, and the liquid level controller together, the occupied space of the device is greatly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic structural diagram of a hot water reuse control system provided by an embodiment of the present invention;

[0021] Figure 2 is a schematic structural diagram of a control mechanism in an embodiment of the present invention;

[0022] Figure 3 is a principle block diagram of temperature control in an embodiment of the present invention;

[0023] In the drawings, the list of components represented by each reference numeral is as follows:

[0024] 1. Water tank; 11. Water inlet pipe; 12. Water outlet pipe; 13. Water pump; 14. Pressure relief valve; 2. Control box; 21. Control panel; 3. Control mechanism; 31. Main comparator; 32. Main PID calculator; 33. Sub-comparator; 34. Sub-PID calculator; 35. Temperature controller; 36. Third comparator; 37. Liquid level controller; 4. Heat insulation and leak prevention plate; 5. Liquid level probe; 6. Electric heating tube; 7. First temperature sensor; 8. Second temperature sensor. Detailed implementation mode

[0025] To facilitate the understanding of this application, the following will describe this application more comprehensively with reference to the relevant attached drawings. Embodiments of this application are shown in the attached drawings. However, this application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of this application more thorough and comprehensive.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this application belongs. The terms used in the specification of this application herein are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0027] As used herein, the singular forms "a", "an" and "the" may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms "include" or "have" etc. specify the presence of the stated features, wholes, steps, operations, components, parts or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts or combinations thereof.

[0028] A hot water reuse control system includes a water tank 1, a control box 2 and a control mechanism 3. The control box 2 is installed above the water tank 1, and a heat insulation and leak prevention plate 4 is provided between the water tank 1 and the control box 2. By separating the water tank 1 and the control box 2 through the heat insulation and leak prevention plate 4, the effects of heat insulation and leak prevention can be achieved, and the control end and the equipment end can be concentrated together, greatly simplifying the occupied space of the equipment.

[0029] The control mechanism 3 is installed in the control box 2, and a control panel 21 is provided on the outer side surface of the control box 2. In this embodiment, a display screen, a liquid level adjustment button and a water temperature adjustment button are provided on the control panel 21. The liquid level and water temperature in the water tank 1 can be displayed in real time through the control panel 21, and the preset liquid level and water temperature can be set.

[0030] On the side wall of the water tank 1, a water inlet pipe 11 and a water outlet pipe 12 are provided. The surplus hot water enters the water tank 1 through the water inlet pipe 11 and is temporarily stored in the water tank 1. By heating the recycled surplus hot water, the energy consumption can be reduced compared with reheating cold water, and the recycling of the surplus hot water can be realized. A water pump 13 is also provided at the bottom of the water tank. The water outlet of the water pump 13 is connected to the water outlet pipe 12 and is used to send the reheated surplus hot water to the user end.

[0031] A liquid level probe 5, an electric heating pipe 6, a first temperature sensor 7 and a second temperature sensor 8 are also provided in the water tank 1. The liquid level probe 5 is used to detect the water level height of the surplus hot water in the water tank 1. The electric heating pipe 6 is used to heat the surplus hot water in the water tank 1. The first temperature sensor 7 is used to detect the temperature of the electric heating pipe 6. The second temperature sensor 8 is used to detect the water temperature in the water tank 1.

[0032] The control mechanism 3 of this embodiment can control the liquid level in the water tank 1 and also control the temperature of the surplus hot water in the water tank 1. By integrating the temperature control and the liquid level control, the occupied space of the equipment is further reduced.

[0033] Specifically, the control mechanism 3 includes a main comparator 31, a main PID arithmetic unit 32, a secondary comparator 33, a secondary PID arithmetic unit 34, a temperature controller 35, a third comparator 36 and a liquid level controller 37. Among them, the main comparator 31, the main PID arithmetic unit 32, the secondary comparator 33, the secondary PID arithmetic unit 34 and the temperature controller 35 are used to control the water temperature in the water tank 1; the third comparator 36 and the liquid level controller 37 are used to control the liquid level in the water tank 1.

[0034] The control panel 21 is connected to the input end of the main comparator 31 and inputs the preset water temperature to the main comparator 31. The second temperature sensor 8 is connected to the feedback end of the main comparator 31 and inputs the current water temperature to the main comparator 31. The output end of the main comparator 31 is connected to the input end of the main PID arithmetic unit 32, and the output end of the main PID arithmetic unit 32 is connected to the input end of the secondary comparator 33. After calculating the error between the current water temperature and the preset water temperature, the main comparator 31 sends it to the main PID arithmetic unit 32. After the main PID arithmetic unit 32 performs PID operation (proportional integral differential operation), it obtains the given temperature of the electric heating pipe 6 and sends the given temperature of the electric heating pipe 6 to the secondary comparator 33.

[0035] The input end of the secondary comparator 33 receives the temperature of the given electric heating tube 6. The first temperature sensor 7 is connected to the feedback end of the secondary comparator 33, and inputs the current temperature of the electric heating tube 6 to the secondary comparator 33. The output end of the secondary comparator 33 is connected to the input end of the secondary PID arithmetic unit 34, the output end of the secondary PID arithmetic unit 34 is connected to the input end of the temperature controller 35, and the output end of the temperature controller 35 is connected to the electric heating tube 6. After calculating the error between the current temperature of the electric heating tube 6 and the preset temperature of the electric heating tube 6, the secondary comparator 33 sends it to the secondary PID arithmetic unit 34. After performing PID operation (proportional integral derivative operation), the secondary PID arithmetic unit 34 controls the temperature controller 35, so as to control the heating of the electric heating tube 6 through the temperature controller 35, and finally control the water temperature to be stable near the preset water temperature.

[0036] In this embodiment, the water temperature is controlled by a double-loop PID regulation method. The water temperature is used as the feedback quantity for the outer-loop control, and the temperature of the electric heating tube is used as the feedback quantity for the inner-loop control, which is more conducive to outputting accurate control values and steplessly adjusting the electric heating tube 6 to ensure the stable control of the water temperature.

[0037] Preferably, the second temperature sensor 8 is arranged at the water inlet of the water pump 13, so that the measured water temperature is closer to the temperature of the water sent to the user.

[0038] The control panel 21 is connected to the input end of the third comparator 36, and inputs the preset liquid level height to the third comparator 36. The liquid level probe 5 is connected to the feedback end of the third comparator 36, and inputs the current liquid level height to the third comparator 36. The output end of the third comparator 36 is connected to the input end of the liquid level controller 37. At the same time, the output end of the main comparator 31 is also connected to the input end of the liquid level controller 37, and the output end of the liquid level controller 37 is connected to the water pump 13. When the third comparator 36 measures that the current liquid level height is higher than the preset liquid level height, and at the same time the main comparator 31 detects that the current water temperature is stable at the preset water temperature, the liquid level controller 37 controls the water pump 13 to send the heated surplus hot water to the user.

[0039] In addition, a pressure relief valve 14 is arranged at the upper part of one side of the water tank 1. When the air pressure exceeds the critical value due to the increase of the liquid level and temperature in the water tank 1, the pressure can be quickly relieved through the pressure relief valve 14.

[0040] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A hot water reuse control system, characterized in that, It includes a control mechanism and a water tank; the water tank is provided with a water inlet pipe and a water outlet pipe, and the water inlet pipe is used to recycle the surplus hot water into the water tank; a water pump is arranged at the bottom of the water tank, and the water outlet of the water pump is communicated with the water outlet pipe for sending the heated surplus hot water to users; an electric heating pipe, a first temperature sensor and a second temperature sensor are arranged in the water tank; the first temperature sensor is used to detect the temperature of the electric heating pipe, and the second temperature sensor is used to detect the temperature of the surplus hot water in the water tank; the electric heating pipe, the first temperature sensor and the second temperature sensor are all electrically connected to the control mechanism; the control mechanism includes a main comparator, a main PID operator, a sub-comparator, a sub-PID operator and a temperature controller; the input end of the main comparator is used to receive a predetermined water temperature signal, and the second temperature sensor is connected to the feedback end of the main comparator, the output end of the main comparator is connected to the input end of the main PID operator, and the output end of the main PID operator outputs the given temperature of the electric heating pipe and is connected to the input end of the sub-comparator; the first temperature sensor is connected to the feedback end of the sub-comparator, and the output end of the sub-comparator is connected to the input end of the sub-PID operator; the output end of the sub-PID operator is connected to the temperature controller, and the output end of the temperature controller is connected to the electric heating pipe.

2. The hot water reuse control system according to claim 1, characterized in that, The second temperature sensor is arranged at the water inlet of the water pump.

3. The hot water reuse control system according to claim 1, characterized in that, A liquid level probe is arranged in the water tank, and the liquid level probe is used to detect the water level height of the surplus hot water in the water tank; the liquid level probe and the water pump are both electrically connected to the control mechanism.

4. The hot water reuse control system according to claim 3, characterized in that, The control mechanism includes a third comparator and a liquid level controller. The input end of the third comparator is used to receive a predetermined liquid level signal, the liquid level probe is connected to the input end of the third comparator, the output end of the third comparator is connected to the liquid level controller, and the output end of the liquid level controller is connected to the water pump.

5. The hot water reuse control system according to claim 1, characterized in that, A control box is arranged above the water tank, the control mechanism is installed in the control box, and a control panel is arranged on the outer side wall of the control box, and the control panel is electrically connected to the control mechanism.

6. The hot water reuse control system according to claim 5, characterized in that, A display screen, a liquid level adjustment button and a water temperature adjustment button are arranged on the control panel.

7. The hot water reuse control system according to claim 5, characterized in that, A heat insulation and leak-proof board is arranged between the water tank and the control box.

8. The hot water reuse control system according to claim 1, characterized in that, A pressure relief valve is arranged at the upper part of the side wall of the water tank.

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