Water temperature keeping device of heating and ventilation system
The HVAC system's water temperature maintaining device improves heating efficiency and stability by integrating a molten salt electric heater, heat exchange tube, and PID controller with interlocking controls, addressing inefficiencies in existing systems.
Patent Information
- Application Number
- CN202420282110.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-06
- Publication Date
- 2024-12-24
- Estimated Expiration
- 2034-02-06
AI Technical Summary
Existing HVAC systems face inefficiencies in heating efficiency and stability due to high damage rates of eddy current heaters and fluctuating heat exchange efficiency of air energy heat exchangers, necessitating a more efficient and stable water temperature maintenance solution.
A water temperature maintaining device for HVAC systems incorporating an expansion water tank, circulating pump, molten salt electric heater, heat exchange tube, valves, and a PID controller, with interlocking controls and an overheat protector to manage temperature and prevent equipment damage.
Enhances heating efficiency and stability by optimizing heat exchange and reducing power consumption, while preventing overheating and equipment damage through interlocking controls and temperature monitoring.
Smart Images
Figure CN222230680U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of heating and heating, in particular to a water temperature maintaining device for a heating and ventilation system. Background Art
[0002] In winter, hot water is transported through pipes, and then the heat of the hot water is dissipated to the required heating space through the radiator. In factories that generate waste heat during the production process, waste heat is often used for self-heating of the factory area. The water temperature used for heating needs to be heated and maintained at 60°C. The main heat source for maintaining water temperature in the existing HVAC system is the electric eddy current heater, and the auxiliary heat source is the air energy heat exchanger. There are the following problems when using it: the eddy current heater has a high damage rate and is replaced frequently, which greatly increases the maintenance cost; the air energy heat exchanger can only exchange and collect heat during the day, and the heat exchange efficiency fluctuates greatly due to the weather. The collected heat is far lower than the heat required for winter heating, and can only be used for backup heating. Therefore, it is necessary to design a water temperature maintenance device for HVAC systems with higher heating efficiency and more stable operation. Utility Model Content
[0003] In view of the above technical problems, the utility model provides a water temperature maintaining device for a HVAC system with higher heating efficiency and more stable operation.
[0004] In order to solve the above technical problems, the technical solution of the utility model is: a water temperature maintaining device for a HVAC system, comprising an expansion water tank and a circulating pump, wherein the liquid inlet of the circulating pump is fixedly connected to a liquid return pipe, the expansion water tank is connected to the liquid return pipe through a three-way interface, the liquid outlet of the circulating pump is fixedly connected to a discharge pipe, and also comprises a molten salt electric heater and a controller, the molten salt electric heater and the circulating pump are both controlled by the controller, a heat exchange tube is arranged in the molten salt electric heater, the liquid inlet of the heat exchange tube is respectively connected to the discharge pipe and the circulating pipe through a liquid inlet three-way interface, the liquid outlet of the heat exchange tube is respectively connected to the circulating pipe and the liquid supply pipe through a liquid outlet three-way interface, a first valve is installed on the liquid inlet of the heat exchange tube, a second valve is installed on the liquid outlet of the heat exchange tube, a third valve is installed on the circulating pipe, a temperature sensor is arranged on the discharge pipe, and the temperature sensor is communicatively connected with the controller.
[0005] Furthermore, a junction box is fixedly connected to the molten salt electric heater, and an overheat protector is installed in the junction box.
[0006] Furthermore, the controller is a PID controller, and the PID controller is installed in a control cabinet.
[0007] Furthermore, the circulation pump and the molten salt electric heater are interlockedly controlled by a controller.
[0008] Compared with the prior art, the utility model has the following advantages:
[0009] 1. The utility model can heat the heating water more efficiently by arranging a controller, a molten salt electric heater and a heat exchange tube, and the molten salt electric heater has a longer service life and a more stable operation; by arranging the first valve, the second valve, the third valve and the circulation pipeline, the heating water that reaches the temperature standard after absorbing the waste heat of production does not pass through the molten salt electric heater when passing through the pipeline, and directly enters the liquid supply pipeline, thereby reducing the power consumption of the molten salt electric heater.
[0010] 2. The utility model provides an overheat protector, which can alarm and stop the molten salt electric heater when the temperature inside the heater exceeds the limit, thereby preventing the temperature inside the heater from being too high and causing danger. By providing an interlocking control between the circulation pump and the switch of the molten salt electric heater, it can be avoided that the molten salt electric heater is started when the circulation pump is not started due to misoperation, thereby preventing dry burning damage to the equipment. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] Figure 1 It is a structural schematic diagram of the utility model.
[0012] In the figure: 1. expansion water tank, 2. circulation pump, 3. control cabinet, 4. return liquid pipeline, 5. discharge pipeline, 6. circulation pipeline, 7. liquid supply pipeline, 8. molten salt electric heater, 9. controller, 10. heat exchange tube, 11. junction box, 12. overheat protector, 13. first valve, 14. second valve, 15. third valve, 16. temperature sensor. DETAILED DESCRIPTION
[0013] The utility model will be further described below in conjunction with the accompanying drawings.
[0014] like Figure 1 A water temperature maintaining device for a HVAC system is shown, comprising an expansion water tank 1 and a circulating pump 2, wherein the liquid inlet of the circulating pump 2 is fixedly connected to a liquid return pipe 4, the expansion water tank 1 is connected to the liquid return pipe 4 through a three-way interface, the liquid outlet of the circulating pump 2 is fixedly connected to a discharge pipe 5, and further comprising a molten salt electric heater 8 and a controller 9, wherein the molten salt electric heater 8 and the circulating pump 2 are both controlled by the controller 9, a heat exchange tube 10 is arranged in the molten salt electric heater 8, the liquid inlet of the heat exchange tube 10 is respectively connected to the discharge pipe 5 and the circulating pipe 6 through a liquid inlet three-way interface, the liquid outlet of the heat exchange tube 10 is respectively connected to the circulating pipe 6 and the liquid supply pipe 7 through a liquid outlet three-way interface, a first valve 13 is installed on the liquid inlet of the heat exchange tube 10, a second valve 14 is installed on the liquid outlet of the heat exchange tube 10, a third valve 15 is installed on the circulating pipe 6, a temperature sensor 16 is arranged on the discharge pipe 5, and the temperature sensor 16 is communicatively connected to the controller 9.
[0015] In this embodiment, the first valve 13, the second valve 14 and the third valve 15 are all gate valves and are fixedly connected to corresponding pipelines through flanges.
[0016] In order to prevent the molten salt electric heater 8 from being overheated and causing danger, a junction box 11 is fixedly connected to the molten salt electric heater 8, and an overheat protector 12 is installed in the junction box 11. When the molten salt electric heater 8 is overheated, an alarm is issued and the heater stops.
[0017] In order to enable temperature monitoring and control between the controller and the molten salt electric heater 8, the controller 9 is a PID controller, the PID controller is installed in the control cabinet 3, and the molten salt electric heater 8 is provided with a temperature monitor compatible with the PID controller.
[0018] In order to avoid the equipment from being dry-burned due to the molten salt electric heater 8 being started by mistake when the circulation pump 2 is not started, the circulation pump 2 and the molten salt electric heater 8 are interlockedly controlled by the controller 9. The molten salt electric heater 8 can only be turned on when the circulation pump 2 is turned on.
[0019] The specific working process of the utility model is as follows:
[0020] First, the first valve 13 and the second valve 14 are opened, and the third valve 15 is closed. The outlet water temperature of the heat exchange tube 10 is set to 60°C in the adjustment interface of the controller 9. The PID adjustment function inside the controller 9 adjusts the power of the molten salt electric heater 8 so that the outlet water temperature of the heat exchange tube 10 is constant at 60°C. The heating water that absorbs the residual heat enters the discharge pipe 5 through the return liquid pipe 4 under the action of the circulation pump 2. The temperature sensor 16 installed on the discharge pipe 5 monitors the water temperature in the pipe in real time, and transmits the signal to the controller 9 and displays it on the display screen of the control cabinet 3. Only when the heating water temperature is not lower than 60°C, the third valve 15 is opened, and the first valve 13 and the second valve 14 are closed; when the heating water temperature is lower than 60°C, the controller 9 starts the molten salt electric heater 8, and the heating water flows through the first valve 13 and the heat exchange tube 10 in turn, absorbs heat and heats up, and then flows through the second valve 14 to enter the liquid supply pipe 7 to heat the factory area.
[0021] When the internal temperature of the molten salt electric heater 8 is too high, the overheating protector 12 starts to disconnect the heating circuit, and the circuit is connected again after the temperature returns to normal; when the circulating pump 2 is not started, the molten salt electric heater 8 will not be able to start under the switch interlocking control, so as to prevent the molten salt electric heater 8 from burning dry.
Claims
1. A water temperature maintaining device for a heating and ventilation system, comprising an expansion water tank (1) and a circulation pump (2), wherein the liquid inlet of the circulation pump (2) is fixedly connected to a liquid return pipe (4), the expansion water tank (1) is connected to the liquid return pipe (4) through a three-way interface, and the liquid outlet of the circulation pump (2) is fixedly connected to a discharge pipe (5), characterized in that: The invention also comprises a molten salt electric heater (8) and a controller (9). The molten salt electric heater (8) and the circulation pump (2) are both controlled by the controller (9). A heat exchange tube (10) is arranged in the molten salt electric heater (8). The liquid inlet of the heat exchange tube (10) is respectively connected to the discharge pipe (5) and the circulation pipe (6) through a liquid inlet three-way interface. The liquid outlet of the heat exchange tube (10) is respectively connected to the circulation pipe (6) and the liquid supply pipe (7) through a liquid outlet three-way interface. A first valve (13) is installed on the liquid inlet of the heat exchange tube (10), a second valve (14) is installed on the liquid outlet of the heat exchange tube (10), a third valve (15) is installed on the circulation pipe (6), and a temperature sensor (16) is arranged on the discharge pipe (5). The temperature sensor (16) is connected to the controller (9) in a communication manner.
2. The water temperature maintaining device for a HVAC system according to claim 1, characterized in that: The molten salt electric heater (8) is fixedly connected to a junction box (11), and an overheat protector (12) is installed in the junction box (11).
3. The water temperature maintaining device for a HVAC system according to claim 1, characterized in that: The controller (9) is a PID controller, and the PID controller is installed in the control cabinet (3).
4. The water temperature maintaining device for a HVAC system according to claim 1, characterized in that: The circulation pump (2) and the molten salt electric heater (8) are interlockedly controlled via a controller (9).