Heat pump unit comprehensive heat recovery device

Abstract

The utility model discloses a kind of heat pump unit comprehensive heat recovery devices, for commercial dish washer heat recovery field.The device includes waste gas heat recovery, waste water heat recovery, heat pump unit, heat exchange water tank, circulating pump, hot water storage tank and intelligent control system.The device recycles the waste gas and waste water heat energy discharged by dish washer, uses heat pump unit to improve heat energy efficiency, stores in hot water storage tank after low-temperature water is heated, to reduce dish washer energy consumption.Its advantages include comprehensive recovery efficiency is high, intelligent control optimizes heat recovery process, and compact structure is easy to implement.The utility model can significantly reduce the energy consumption of cleaning equipment in catering industry, realizes energy-saving and environmental protection goal.

Description

Technical Field

[0001] This utility model relates to the field of heat recovery technology for commercial dishwashers, and more specifically, to a comprehensive heat recovery device for heat pump units. Background Technology

[0002] Currently, dishwashers and container cleaning machines are used to clean tableware and food transfer containers in the catering and food processing industries. However, the biggest challenge is the huge energy consumption, with the largest energy consumption being the electricity used to heat water.

[0003] Current commercial dishwashers generate large amounts of wastewater at 60-85℃ and high-temperature steam above 80℃ during the washing process, resulting in energy waste due to direct discharge. Traditional single heat recovery devices have significant drawbacks: they can only recover exhaust heat, leaving wastewater heat unutilized; heat exchange efficiency is greatly affected by water quality, making it difficult to effectively raise the temperature of low-temperature wastewater (<50℃); initial investment is high, and multi-heat source synergistic optimization is not achieved. Actual measurements show that a certain brand of commercial dishwasher consumes 38kWh per hour, with 72% of the energy used for heating cold water.

[0004] No effective solutions have yet been proposed to address the problems in the relevant technologies. Utility Model Content

[0005] In view of the problems in the related technologies, this utility model proposes a comprehensive heat recovery device for heat pump units to overcome the above-mentioned technical problems existing in the existing related technologies.

[0006] Therefore, the specific technical solution adopted by this utility model is as follows: A heat pump unit integrated heat recovery device includes a dishwasher exhaust port. An exhaust gas steam heat recovery device is fixedly connected to the outside of the dishwasher exhaust port by bolts. The outside of the exhaust gas steam heat recovery device is respectively equipped with a heat pump unit, a heat exchange water tank, a hot water storage tank, and a wastewater heat recovery device. The heat pump unit is also equipped with an intelligent control system.

[0007] As a further embodiment of this invention, an exhaust fan is installed on the top of the waste gas steam heat recovery unit.

[0008] As a further embodiment of this utility model, the waste gas steam heat recovery unit is equipped with an evaporator inside, and the copper tube of the evaporator is connected to the heat pump unit.

[0009] As a further embodiment of this utility model, the heat exchange water tank is equipped with a condenser, and the copper pipe of the condenser is connected to the heat pump unit.

[0010] As a further embodiment of this utility model, a circulating water pipe is installed on the outside of the heat exchange water tank, the hot water storage tank is located between the circulating water pipes, a circulating pump is installed between the hot water storage tank and the heat exchange water tank at one end, and a solenoid valve is installed between the hot water storage tank and the heat exchange water tank at the other end.

[0011] As a further embodiment of this utility model, a water guide baffle is provided on the inner side of the wastewater heat recovery unit, and a heat exchange tube is installed on the inner side of the wastewater heat recovery unit, with the end of the heat exchange tube connected to the heat exchange water tank.

[0012] As a further embodiment of this utility model, a dishwasher wastewater inlet is installed on the outside of the wastewater heat recovery unit, a drain outlet is installed on the other side of the wastewater heat recovery unit, and a water valve is installed at the end of the heat exchange tube of the wastewater heat recovery unit.

[0013] The intelligent control system includes a temperature sensor group, a PLC controller and a human-machine interface. The temperature sensors are respectively installed at the dishwasher exhaust port, the wastewater heat recovery unit drain port and the inside of the hot water storage tank.

[0014] The beneficial effects of this utility model are as follows: This utility model incorporates a waste gas steam heat recovery unit, a heat pump unit, a heat exchange water tank, a hot water storage tank, and a wastewater heat recovery unit. The evaporator in the waste gas steam heat recovery unit directly absorbs the sensible and latent heat of the exhaust gas, while the wastewater heat recovery unit extends the wastewater residence time through a baffle plate. This dual system raises the initial water temperature by 15-25°C. The heat pump unit absorbs low-temperature heat (50-65°C) through the evaporator, which is then boosted to a high-temperature heat source (75-90°C) by the compressor, achieving a COP of 4.2, making it more energy-efficient than traditional electric heating. A temperature sensor monitors the exhaust temperature in real time, and the exhaust fan adjusts the airflow to maintain the optimal heat exchange temperature difference. A solenoid valve automatically switches between water replenishment and heat preservation modes based on the water level in the hot water storage tank. The device's rational design makes the modules more compact, saving floor space. The biggest difference between this device and similar external products is that external heat recovery devices use separate waste gas or wastewater heat recovery systems, while this device uses integrated heat energy recovery from both waste gas and wastewater, significantly improving recovery efficiency and greatly reducing energy consumption. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1This is a schematic diagram of the overall structure of a heat pump unit integrated heat recovery device according to an embodiment of the present utility model.

[0017] In the picture: 1. Dishwasher exhaust port; 2. Waste gas steam heat recovery unit; 3. Exhaust fan; 4. Heat pump unit; 5. Heat exchange water tank; 6. Circulation pump; 7. Hot water storage tank; 8. Solenoid valve; 9. Wastewater heat recovery unit; 10. Water inlet; 11. Drain outlet; 12. Water valve; 13. Dishwasher wastewater discharge port. Detailed Implementation

[0018] To further illustrate the various embodiments, the present invention provides accompanying drawings, which are part of the disclosure of the present invention. These drawings are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, those skilled in the art should be able to understand other possible implementation methods and the advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are usually used to represent similar components.

[0019] According to an embodiment of the present invention, a comprehensive heat recovery device for a heat pump unit is provided.

[0020] Please refer to the instruction manual appendix. Figure 1 According to an embodiment of the present utility model, a heat pump unit integrated heat recovery device includes a dishwasher exhaust port 1. An exhaust gas steam heat recovery device 2 is fixedly connected to the outside of the dishwasher exhaust port 1 by bolts. A heat pump unit 4, a heat exchange water tank 5, a hot water storage tank 7, and a wastewater heat recovery device 9 are respectively provided on the outside of the exhaust gas steam heat recovery device 2. The heat pump unit 4 is also equipped with an intelligent control system.

[0021] In one embodiment, please refer to the appendix to the specification. Figure 1 As a further embodiment of this utility model, an exhaust fan 3 is installed on the top of the waste gas steam heat recovery unit 2.

[0022] In one embodiment, please refer to the appendix to the specification. Figure 1 As a further embodiment of this utility model, the waste gas steam heat recovery unit 2 is equipped with an evaporator inside, and the copper tube of the evaporator is connected to the heat pump unit 4.

[0023] In one embodiment, please refer to the appendix to the specification. Figure 1 As a further embodiment of this utility model, the heat exchange water tank 5 is equipped with a condenser, and the copper pipe of the condenser is connected to the heat pump unit 4.

[0024] In one embodiment, please refer to the appendix to the specification. Figure 1As a further embodiment of this utility model, a circulating water pipe is installed on the outside of the heat exchange water tank 5, and the hot water storage tank 7 is located between the circulating water pipes. A circulating pump 6 is installed between the hot water storage tank 7 and the heat exchange water tank 5 at one end, and a solenoid valve 8 is installed between the hot water storage tank 7 and the heat exchange water tank 5 at the other end.

[0025] In one embodiment, please refer to the appendix to the specification. Figure 1 As a further embodiment of this utility model, the wastewater heat recovery unit 9 is provided with a water guide baffle on its inner side, and a heat exchange tube is installed on the inner side of the wastewater heat recovery unit 9, with the end of the heat exchange tube connected to the heat exchange water tank 5.

[0026] In one embodiment, please refer to the appendix to the specification. Figure 1 As a further embodiment of this utility model, a dishwasher wastewater inlet 13 is installed on the outside of the wastewater heat recovery unit 9, a drain outlet 11 is installed on the other side of the wastewater heat recovery unit 9, and a water valve 12 is installed at the end of the heat exchange tube of the wastewater heat recovery unit 9.

[0027] In one embodiment, please refer to the appendix to the specification. Figure 1 As a further embodiment of this utility model, the intelligent control system includes a temperature sensor group, a PLC controller and a human-machine interface. The temperature sensors are respectively installed inside the dishwasher exhaust port 1, the wastewater heat recovery unit 9, the drain port 11 and the hot water storage tank 7.

[0028] A comprehensive heat energy recovery device for a cleaning machine integrates an inlet pipe, a drain pipe, an exhaust gas heat energy recovery device, an exhaust wastewater heat energy recovery device, a heat exchange device, a heat pump unit, a hot water circulation device, and a hot water storage device. This device automatically recovers the heat energy from the exhaust gas and wastewater discharged by the machine through an intelligent control system, both during operation and standby. The specific principle is summarized below: 1. The wastewater heat recovery device mainly consists of an inlet pipe and an outlet pipe. When the low-temperature water in the inlet pipe enters the heat exchange pipe in the wastewater heat recovery device, it combines with the wastewater outside the inlet pipe to exchange heat. The wastewater flows in a regular manner through the guide plate set in the heat recovery device, thereby achieving a better heat recovery effect.

[0029] 2. A heat pump unit is a heat energy lifting device that can transfer heat energy from the low-temperature end (evaporator end) to the high-temperature end (condenser end). It is an energy-saving device equipped with a condenser, a compressor, an evaporator, and a throttling device. It can concentrate dispersed heat energy into usable heat energy. In this device, the evaporator of the heat pump unit is installed in the exhaust channel containing waste heat, and the condenser of the heat pump unit is installed in the heat exchange device. When hot steam with residual heat is discharged from the exhaust outlet, the temperature of the evaporator rises, and then the temperature of the condenser end is raised by the heat pump unit, thereby raising the temperature of the water entering the heat exchanger.

[0030] 3. The hot water circulation and storage device pumps hot water from the heat exchanger to a storage tank for storage. The circulation system ensures a more even temperature distribution of the heated water. The number of storage tanks should be determined based on the washing capacity of the cleaning machine.

[0031] 4. The exhaust fan installed at the exhaust port uses intelligent control to automatically adjust the emission volume by tracking the exhaust temperature, thereby optimizing the heat recovery efficiency. Example

[0032] The dishwasher exhaust port 1 is connected to the waste gas steam heat recovery unit 2 via a flange. The copper tubes of the internal evaporator are arranged in a finned manner and connected to the heat pump unit 4 through the refrigerant pipeline. The wastewater heat recovery unit 9 is equipped with several layers of flow guide baffles. After the dishwasher wastewater enters through the inlet 13, it flows in the opposite direction to the heat exchange tube. The drain outlet 11 is equipped with a TDS monitoring probe to prevent scaling. Example

[0033] Heat exchange system workflow: 1. Waste gas recovery path: High temperature steam → Evaporator of waste gas steam heat recovery unit 2 → Compressor of heat pump unit 4 → Condenser of heat exchange water tank 5. 2. Wastewater recycling path: Dishwasher wastewater discharge port 13 → flow in layers through guide baffles → cold water in heating heat exchange tubes → flow rate controlled by water valve 12; 3. Hot water circulation system: heat exchange water tank 5 → circulation pump 6 → hot water storage tank 7 → solenoid valve 8 → return to heat exchange water tank 5 to form a closed loop; Example

[0034] Intelligent control logic: When the exhaust temperature is >75℃, the exhaust fan 3 reduces its speed to 800rpm to extend the heat exchange time; when the water temperature in the hot water storage tank 7 is ≥70℃, the solenoid valve 8 shuts off the circulation pump 6 and starts the heat preservation mode; when the wastewater TDS is >500ppm, the water valve 12 automatically opens the flushing mode.

[0035] The biggest difference between this device and similar external products is that external heat recovery devices use separate waste gas heat recovery or separate wastewater heat recovery, while this device adopts comprehensive heat energy recovery of waste gas and wastewater, which significantly improves the recovery efficiency and greatly reduces the energy consumption of the machine.

[0036] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A heat pump unit integrated heat recovery device, comprising a dishwasher exhaust port (1), characterized in that: The exhaust port (1) of the dishwasher is fixedly connected to the outside of the exhaust steam heat recovery unit (2) by bolts. The outside of the exhaust steam heat recovery unit (2) is respectively equipped with a heat pump unit (4), a heat exchange water tank (5), a hot water storage tank (7) and a wastewater heat recovery unit (9). The heat pump unit (4) is also equipped with an intelligent control system.

2. The integrated heat recovery device for a heat pump unit according to claim 1, characterized in that: An exhaust fan (3) is installed on the top of the waste gas steam heat recovery unit (2).

3. The integrated heat recovery device for a heat pump unit according to claim 1, characterized in that: The waste gas steam heat recovery unit (2) is equipped with an evaporator inside, and the copper pipe of the evaporator is connected to the heat pump unit (4).

4. The integrated heat recovery device for a heat pump unit according to claim 1, characterized in that: The heat exchange water tank (5) is equipped with a condenser, and the copper pipe of the condenser is connected to the heat pump unit (4).

5. The integrated heat recovery device for a heat pump unit according to claim 1, characterized in that: A circulating water pipe is installed on the outside of the heat exchange water tank (5), and the hot water storage tank (7) is located between the circulating water pipes. A circulating pump (6) is installed between the hot water storage tank (7) and the heat exchange water tank (5) at one end, and a solenoid valve (8) is installed between the hot water storage tank (7) and the heat exchange water tank (5) at the other end.

6. The integrated heat recovery device for a heat pump unit according to claim 1, characterized in that: The wastewater heat recovery unit (9) is provided with a water guide baffle on its inner side, and a heat exchange tube is installed on the inner side of the wastewater heat recovery unit (9), and the end of the heat exchange tube is connected to the heat exchange water tank (5).

7. A comprehensive heat recovery device for a heat pump unit according to claim 6, characterized in that: The wastewater heat recovery unit (9) is equipped with a dishwasher wastewater inlet (13) on the outside, a drain outlet (11) on the other side, and a water valve (12) on the end of the heat exchange tube of the wastewater heat recovery unit (9).

8. The integrated heat recovery device for a heat pump unit according to claim 1, characterized in that: The intelligent control system includes a temperature sensor group, a PLC controller and a human-machine interface. The temperature sensors are respectively installed in the dishwasher exhaust port (1), the drain port (11) of the wastewater heat recovery unit (9) and the hot water storage tank (7).

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