Multifunctional heat pump hot water unit

Abstract

The utility model relates to the technical field of heat pump hot water units, and discloses a multifunctional heat pump hot water unit which comprises a compressor, a heat recoverer, a four-way valve, a condenser, an electronic expansion valve, a liquid storage device and an evaporator which are sequentially connected through pipelines, and the output end of the evaporator is communicated with a gas-liquid separator through a pipeline and the four-way valve. The other end of the gas-liquid separator communicates with the input end of the compressor, the heat recoverer comprises an input end and an output end, and the input end of the heat recoverer communicates with a water pump through a three-way adjusting valve. On the basis that the heat recoverer and the condenser are connected in series in the prior art, the three-way regulating valve and the water pump are integrated in the hot water loop, hot water can be conveyed according to requirements, meanwhile, refrigerants and lubricating oil in the heat recoverer always participate in circulation, the problems of detained lubricating oil and poor lubrication in the system do not exist, the system runs safely and reliably, and the service life of the system is prolonged. And the whole refrigerating system design does not need to switch valves, the pipeline design is simple, and faults caused by frequent switching are avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of heat pump water heaters, in particular to a multifunctional heat pump water heater. Background Art

[0002] The multifunctional heat pump hot water unit can provide almost free hot water while refrigerating, so it is particularly suitable for places with both cooling and heating needs. The unit has a very high comprehensive energy efficiency ratio and high comprehensive energy utilization rate, and has been widely used.

[0003] Existing multifunctional water heater technology:

[0004] The common multifunctional heat pump water heater refrigeration system adopts the parallel connection of heat recovery device and fin condenser, and realizes the working modes of refrigeration, refrigeration + hot water, heating, etc. through valve switching:

[0005] Cooling mode: Through valve switching, the condenser works and the heat recovery device does not work.

[0006] Cooling + hot water mode: Through the valve switch, the heat recovery device works and the condenser does not work.

[0007] Some multifunctional heat pump hot water unit refrigeration systems also use the heat recovery device and condenser in series:

[0008] Cooling mode: The unit operates in cooling mode, and the hot water pump does not operate.

[0009] Cooling + hot water mode: The unit operates in cooling mode and the hot water pump operates.

[0010] The refrigeration system using parallel units has the following disadvantages:

[0011] (1) When the system switches to cooling + hot water mode, the finned condenser does not work, the refrigerant in the condenser does not participate in the circulation, and the refrigerant and part of the lubricating oil are also retained inside the condenser and cannot participate in the system circulation, which may cause the system to lack oil, which may easily lead to poor lubrication of the compressor and more system failures. When the system switches to normal cooling mode, the heat recovery device does not work, and part of the refrigerant and lubricating oil are retained in the heat recovery device, which is also likely to cause poor circulation of the lubricating oil and easily cause system failures;

[0012] (2) There are many switching-related valves, complex pipelines, high manufacturing difficulty, and small maintenance space;

[0013] (3) When the hot water temperature reaches the set value and the unit switches operating conditions, the hot water outlet temperature fluctuates greatly.

[0014] The refrigeration system using series units has the following disadvantages:

[0015] (1) When the unit is turned on and the hot water pump is turned on, the hot water generated by the heat recovery device is automatically delivered. Even if the customer does not need hot water, hot water is still automatically generated and delivered continuously, which is not conducive to customer use;

[0016] (2) When the machine is started for the first time, the hot water pump runs at the same time, and the hot water generated by the heat recovery device is automatically transported. At this time, the water temperature is close to the external ambient temperature, and the water temperature cannot meet the customer's needs. It will take some time for the water temperature to gradually reach the customer's required temperature. Utility Model Content

[0017] The utility model aims to solve the problems existing in the prior art and proposes a multifunctional heat pump water heater unit.

[0018] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0019] A multifunctional heat pump water heater unit comprises a compressor, a heat recovery device, a four-way valve, a condenser, an electronic expansion valve, a liquid storage device and an evaporator which are connected in sequence through pipelines, and the output end of the evaporator is connected to a gas-liquid separator through a pipeline and a four-way valve, the other end of the gas-liquid separator is connected to the input end of the compressor, the heat recovery device comprises an input end and an output end, and its input end is connected to a water pump through a three-way regulating valve.

[0020] Preferably, the output end of the heat recovery device is connected to the evaporator through a pipeline and a four-way valve, and the output end of the condenser is connected to the gas-liquid separator through a pipeline and a four-way valve.

[0021] Preferably, the heat recovery device comprises an input end and an output end, and the input end is connected to a water pump via a three-way regulating valve.

[0022] Preferably, the condenser is a fin condenser.

[0023] Preferably, the output end of the water pump is connected to the heating end, and temperature sensors are provided in the heating end and the heat recovery device.

[0024] Compared with the prior art, the beneficial effects of the utility model are:

[0025] The utility model integrates a three-way regulating valve and a water pump in the hot water circuit on the basis of the prior art that the heat recovery device and the condenser are connected in series. When the unit is started for the first time, the three-way regulating valve shall not be energized, the water pump shall be running, the water circuit of the heat recovery device shall be closed, and hot water shall not be output to the outside. The water in the heat recovery device is continuously heated until the water temperature reaches the temperature set by the customer. The three-way regulating valve shall be energized, and the hot water in the heat recovery device that meets the temperature requirement shall be transported out. When the water temperature exceeds the upper limit temperature value set by the customer, the three-way regulating valve shall be switched, and the heat recovery device shall not output hot water to the outside. When the water temperature drops to the lower limit temperature set by the customer, the three-way regulating valve shall be switched, and the hot water in the heat recovery device shall be transported out. At the same time, the refrigerant and lubricating oil in the heat recovery device are always involved in the circulation. There is no retained lubricating oil in the system, and there is no problem of poor lubrication. The system runs safely and reliably. The entire refrigeration system design does not require switching valves, and the piping design is simple, thus avoiding failures caused by frequent switching. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 The utility model is a schematic diagram of the composition of a multifunctional heat pump water heater unit.

[0027] In the figure: 1. compressor; 2. heat recovery device; 3. three-way regulating valve; 4. water pump; 5. condenser; 6. electronic expansion valve; 7. liquid storage device; 8. evaporator; 9. four-way valve; 10. gas-liquid separator. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0029] Reference Figure 1 A multifunctional heat pump water heater unit comprises a compressor 1, a heat recovery device 2, a four-way valve 9, a condenser 5, an electronic expansion valve 6, a liquid storage device 7, and an evaporator 8 which are connected in sequence through pipelines, and the output end of the evaporator 8 is connected to a gas-liquid separator 10 through a pipeline and the four-way valve 9, wherein the condenser 5 is a fin condenser 5, and the other end of the gas-liquid separator 10 is connected to the input end of the compressor 1, the heat recovery device 2 comprises an input end and an output end, and its input end is connected to a water pump 4 through a three-way regulating valve 3.

[0030] After the condenser 5 is cooled, the water in the condenser 2 is turned on and the condenser 5 is turned off, and the condenser 5 is turned on and the condenser 2 is turned on, the condenser 5 turns on and the condenser 5 turns on.

[0031] In this embodiment, the output end of the heat recovery device 2 is connected to the evaporator 8 through a pipeline and a four-way valve 9, and the output end of the condenser 5 is connected to the gas-liquid separator 10 through a pipeline and a four-way valve 9.

[0032] In this embodiment, the heat recovery device 2 includes an input end and an output end, and the input end is connected to a water pump 4 via a three-way regulating valve 3 .

[0033] In this embodiment, the output end of the water pump 4 is connected to the heating end, and temperature sensors are provided in the heating end and the heat recovery device 2 .

[0034] Working principle:

[0035] This device includes three typical working modes:

[0036] Refrigeration mode: Low-temperature and low-pressure gaseous refrigerant is compressed into high-temperature and high-pressure gaseous refrigerant by compressor 1, flows through heat recovery device 2 and four-way valve 9 to reach condenser 5, and the condensed normal-temperature and high-pressure liquid refrigerant is throttled by electronic expansion valve 6 to reduce its pressure, and the low-pressure liquid refrigerant passes through liquid storage device 7 to reach evaporator 8 to evaporate and absorb heat and gasify, and the low-temperature and low-pressure gaseous refrigerant passes through gas-liquid separator 10 and returns to compressor 1, completing a working cycle. At the same time, the water in evaporator 8 is continuously cooled and becomes low-temperature chilled water.

[0037] Refrigeration + hot water mode: low-temperature and low-pressure gaseous refrigerant is compressed into high-temperature and high-pressure gaseous refrigerant by compressor 1, flows through heat recovery device 2 and four-way valve 9 to reach condenser 5, and the condensed normal-temperature and high-pressure liquid refrigerant is throttled by electronic expansion valve 6 to reduce its pressure, and the low-pressure liquid refrigerant passes through liquid storage device 7 to reach evaporator 8 to evaporate and absorb heat and gasify, and the low-temperature and low-pressure gaseous refrigerant passes through gas-liquid separator 10 and returns to compressor 1, completing a working cycle. At the same time, the water in evaporator 8 is continuously cooled and becomes low-temperature chilled water; the water in heat recovery device 2 is continuously heated and becomes hot water.

[0038] Heating mode: Low-temperature and low-pressure gaseous refrigerant is compressed into high-temperature and high-pressure gaseous refrigerant by compressor 1, flows through heat recovery device 2, four-way valve 9 to reach evaporator 8 (actually condenser 5) for condensation, and the condensed normal-temperature and high-pressure liquid refrigerant passes through liquid storage device 7 and electronic expansion valve 6 for throttling, and the pressure is reduced. The low-pressure liquid refrigerant enters condenser 5 (actually evaporator 8) to evaporate and absorb heat, and becomes low-temperature and low-pressure gaseous refrigerant, which passes through gas-liquid separator 10 and returns to compressor 1, completing a working cycle. At the same time, the refrigerant continuously releases heat in evaporator 8, and the water is heated to hot water.

[0039] Among them, the three-way regulating valve 3 is built into the multifunctional heat pump water heater. The unit automatically controls the three-way regulating valve 3 to ensure that the water temperature at the unit outlet is constant. When the unit is stopped or shut down, the three-way regulating valve 3 automatically switches to the state where the water circuit of the heat recovery device 2 is closed.

[0040] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A multifunctional heat pump water heater unit, characterized in that: It includes a compressor, a heat recovery device, a four-way valve, a condenser, an electronic expansion valve, a liquid storage device, and an evaporator which are connected in sequence through pipelines, and the output end of the evaporator is connected to a gas-liquid separator through a pipeline and a four-way valve, and the other end of the gas-liquid separator is connected to the input end of the compressor. The heat recovery device includes an input end and an output end, and its input end is connected to a water pump through a three-way regulating valve.

2. A multifunctional heat pump water heater unit according to claim 1, characterized in that: The output end of the heat recovery device is communicated with the evaporator through a pipeline and a four-way valve, and the output end of the condenser is communicated with the gas-liquid separator through a pipeline and a four-way valve.

3. A multifunctional heat pump water heater unit according to claim 2, characterized in that: The condenser is a fin condenser.

4. A multifunctional heat pump water heater unit according to claim 2, characterized in that: The output end of the water pump is connected to the heating end, and temperature sensors are arranged in the heating end and the heat recovery device.

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