Ultra-efficient air source heat pump system and working process thereof

Abstract

The invention relates to the field of heat pumps, in particular to a super-efficient air source heat pump system and a working process thereof.The super-efficient air source heat pump system comprises a compressor, an economizer, a condenser, a four-way reversing valve and four sets of evaporators.The four-way reversing valve is provided with a port a, a port b, a port c and a port d, the two sides of the compressor are connected with the condenser and a gas-liquid separator respectively, and the evaporator is connected with the economizer; the gas-liquid separator is connected with the economizer, the condenser is respectively connected with the hot water circulating pump, the water tank and the liquid storage tank, the hot water circulating pump is respectively connected with the water tank and the cold water inlet, the economizer is respectively connected with the liquid storage tank, the opening a and the opening d, and the four groups of evaporators are all connected with different filters. According to the product, the function of uninterrupted heating in winter is achieved, and the operation stability of the device is improved; the product can ensure that the heat exchange medium has the same flow under the working conditions of low environment temperature and high environment temperature and has the same temperature difference under the working conditions of low environment temperature and high environment temperature.

Description

Technical Field

[0001] The present invention relates to the field of heat pumps, in particular to an ultra-high-efficiency air-source heat pump system and its working process. Background Art

[0002] Air-source heat pump technology is an energy-saving and environmentally friendly heating technology based on the reverse Carnot cycle, utilizing natural energy (such as air thermal storage) to generate a low-temperature heat source. The evaporator absorbs low-temperature heat from the outside air, causing the refrigerant to evaporate and absorb heat, thereby lowering the outside air temperature and turning the refrigerant into a low-temperature, low-pressure gas. The low-temperature, low-pressure refrigerant is then drawn into the compressor and compressed into a high-temperature, high-pressure gas. It then enters the condenser, where it exchanges heat with hot water, releasing high-temperature heat and raising the water temperature. During this process, the refrigerant transforms from a gas to a liquid, releasing a significant amount of heat. Finally, the high-temperature, high-pressure refrigerant is reduced in pressure and expanded by the expansion valve before returning to the evaporator, absorbing heat and evaporating, completing the cycle. This cycle repeats, continuously absorbing heat from the low-temperature source and transferring it to the water to be heated, reaching the desired temperature.

[0003] However, existing air-source heat pump technology has the following drawbacks: 1. A significant drop in efficiency at low ambient temperatures: In extremely cold weather, the heating efficiency of an air-source heat pump will drop significantly. When the outdoor ambient temperature is too low, the amount of heat absorbed from the air will decrease, resulting in insufficient heating capacity and difficulty in meeting higher thermal energy demands. 2. High winter operating costs: Existing air-source heat pump technology is affected by ambient temperature in winter, and its heating efficiency will drop significantly, directly leading to increased operating costs. Under the same heat load demand, winter operating costs are twice or even more than summer operating costs. 3. Frost impact: In winter, when humidity is high, the evaporator surface of the air-source heat pump system is prone to frost. Frost will hinder air circulation and reduce heat exchange efficiency, requiring regular defrosting operations, which not only consumes additional energy but also affects the continuous operation of the system. 4. High initial investment: Currently, the configuration of an air-source heat pump must be selected according to the output power when the heating efficiency is lowest in winter. In order to compensate for the low efficiency in winter, the configuration of the unit is increased, which increases the initial investment cost. Summary of the Invention

[0004] To achieve the above objectives, the present invention aims to provide an ultra-high-efficiency air-source heat pump system that can solve the problems existing in the background technology. The present invention provides the following technical solutions: A super-efficient air source heat pump system comprises a compressor, an economizer, a condenser, a four-way reversing valve and four groups of evaporators, the four groups of evaporators comprising a first evaporator, a second evaporator, a third evaporator and a fourth evaporator, the four-way reversing valve being provided with ports a, b, c and d, two sides of the compressor being respectively connected to one side of the condenser and one side of a gas-liquid separator, the other side of the gas-liquid separator being connected to one side of the economizer, the remaining three sides of the condenser being respectively connected to one side of a hot water circulation pump, a water tank and one side of a liquid storage tank, the other side of the hot water circulation pump being respectively connected to the water tank and a cold water inlet, the water tank being provided with a hot water outlet, the remaining three sides of the economizer being respectively connected to the other side of the liquid storage tank, port a and port d, port c being respectively connected to the first evaporator and the fourth evaporator, port b being respectively connected to the second evaporator and the third evaporator, the first evaporator, the second evaporator, the third evaporator and the fourth evaporator being connected to different filters, the filter of the first evaporator being connected to the filter of the second evaporator being connected via a throttle valve, the filter of the third evaporator being connected to the filter of the fourth evaporator being connected via another throttle valve. Compared with existing products, this product has been improved in structure by changing the position of the four-way reversing valve in the original system and adding three sets of evaporators.

[0005] As a further solution of the present invention: the first evaporator, the second evaporator, the third evaporator and the fourth evaporator are all connected to different fans, which can increase the working efficiency of the evaporators.

[0006] As a further solution of the present invention, the fan adopts an axial flow fan, which is easily available in the market and has good use effect.

[0007] As a further solution of the present invention: a throttle is installed at the outlet of the compressor to control the flow and pressure of the compressor, thereby achieving pressure buffering of the fluid and reducing impact force.

[0008] As a further solution of the present invention, the throttle valve adopts an expansion valve, which has good throttling effect, low cost and is easy to replace.

[0009] As a further solution of the present invention: the filter adopts a drying filter, and the desiccant of the drying filter is granular silica gel, which is convenient for repeated use after heating to ensure that the filter can continue to filter.

[0010] A working process of an ultra-efficient air source heat pump system includes the following steps: 1. When frost forms on the surfaces of the second and third evaporators, the high-temperature and high-pressure medium in the compressor enters the condenser and heats the heat exchange medium in the condenser. The heated heat exchange medium enters the economizer through the liquid storage tank to return air to the compressor and exchange heat. The heat exchange medium in the economizer enters the four-way reversing valve. When the four-way reversing valve is not energized, the heat exchange medium flows from port b to the second and third evaporators at the same time, thereby dissipating heat or defrosting the second and third evaporators with waste heat. The heat exchange medium flowing out of the second and third evaporators is throttled by the filter and the throttle valve and flows to the first and fourth evaporators respectively for evaporation and heat absorption. The heat exchange medium after evaporation and heat absorption merges together and flows to port c of the four-way reversing valve. Then, it flows from port d of the four-way reversing valve through the economizer and the gas-liquid separator back to the compressor, and can be compressed and circulated again to achieve the heating purpose. 2. When frost forms on the surfaces of the first and fourth evaporators, the four-way reversing valve is energized and switches the flow direction. The heat exchange medium flows from the C port of the four-way reversing valve to the first and fourth evaporators at the same time, thereby dissipating heat or defrosting the first and fourth evaporators with waste heat. The heat exchange medium flowing out of the first and fourth evaporators passes through the filter and the throttle valve and then flows to the second and third evaporators respectively for evaporation and heat absorption. The heat exchange medium after evaporation and heat absorption merges together and flows to the B port of the four-way reversing valve, and then flows from the D port of the four-way reversing valve through the economizer and the gas-liquid separator back to the compressor, and can be compressed and circulated again to achieve the heating purpose.

[0011] Compared with the prior art, the present invention has the following beneficial effects: This product uses four evaporators and an intelligent control system to achieve uninterrupted heating in winter, improving the operating stability of the device; This product has a dual throttling system, which can ensure that the flow rate of the heat exchange medium is the same under low ambient temperature and high ambient temperature conditions. This product also has a dual evaporation system and enthalpy increase system, which can ensure that the temperature difference of the heat exchange medium under low ambient temperature and high ambient temperature conditions is the same. The heating efficiency of this product under low ambient temperature conditions is close to that under high ambient temperature conditions, which improves the overall heating efficiency of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the structure of an existing air source heat pump.

[0013] Figure 2 Schematic diagram of the structure of the ultra-high efficiency air source heat pump system in an embodiment of the present invention.

[0014] In the figure: 1- compressor; 2- four-way reversing valve; 3- condenser; 4- liquid storage tank; 5- filter; 6- throttle valve; 7- evaporator; 71- first evaporator; 72- second evaporator; 73- third evaporator; 74- fourth evaporator; 8- fan; 9- gas-liquid separator; 10- hot water circulation pump; 11- cold water inlet; 12- water tank; 13- hot water outlet; 14- economizer. DETAILED DESCRIPTION

[0015] The following will provide a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0016] The specific implementation of the present invention is described in detail below with reference to specific embodiments.

[0017] Example 1 See Figure 1-2 , an ultra-high-efficiency air source heat pump system, comprising a compressor 1, an economizer 14, a condenser 3, a four-way reversing valve 2 and four groups of evaporators 7, the four groups of evaporators 7 comprising a first evaporator 71, a second evaporator 72, a third evaporator 73 and a fourth evaporator 74, the four-way reversing valve 2 is provided with ports a, b, c and d, the two sides of the compressor 1 are respectively connected to one side of the condenser 3 and one side of the gas-liquid separator 9, the other side of the gas-liquid separator 9 is connected to one side of the economizer 14, the remaining three sides of the condenser 3 are respectively connected to one side of the hot water circulation pump 10, the water tank 12 and one side of the liquid storage tank 4, the other side of the hot water circulation pump 10 is respectively connected to the water tank 12 and The economizer 14 is connected to a cold water inlet 11, and a hot water outlet 13 is provided on the water tank 12. The remaining three sides of the economizer 14 are respectively connected to the other side of the liquid storage tank 4, ports a and d. Port c is respectively connected to the first evaporator 71 and the fourth evaporator 74, and port b is respectively connected to the second evaporator 72 and the third evaporator 73. The first evaporator 71, the second evaporator 72, the third evaporator 73, and the fourth evaporator 74 are each connected to a different filter 5. The filter 5 of the first evaporator 71 and the filter 5 of the second evaporator 72 are connected via a throttle valve 6, and the filter 5 of the third evaporator 73 and the filter 5 of the fourth evaporator 74 are connected via another throttle valve 6. Compared with existing products, this product has been structurally improved by changing the position of the four-way reversing valve 2 in the original system, adding three sets of evaporators 7, and combining it with an intelligent control system to achieve uninterrupted heating in winter and improve the operational stability of the device.

[0018] In a further solution of this embodiment, the first evaporator 71 , the second evaporator 72 , the third evaporator 73 and the fourth evaporator 74 are all connected to different fans 8 , which can increase the working efficiency of the evaporators 7 .

[0019] In a further solution of this embodiment, the fan 8 adopts an axial flow fan, which is easily available in the market and has good performance.

[0020] In a further solution of this embodiment, a throttle is installed at the outlet of the compressor 1 to control the flow rate and pressure of the compressor 1, thereby achieving pressure buffering of the fluid and reducing impact force.

[0021] Example 2 See Figure 1-2 , an ultra-high-efficiency air source heat pump system, comprising a compressor 1, an economizer 14, a condenser 3, a four-way reversing valve 2 and four groups of evaporators 7, the four groups of evaporators 7 comprising a first evaporator 71, a second evaporator 72, a third evaporator 73 and a fourth evaporator 74, the four-way reversing valve 2 is provided with ports a, b, c and d, the two sides of the compressor 1 are respectively connected to one side of the condenser 3 and one side of the gas-liquid separator 9, the other side of the gas-liquid separator 9 is connected to one side of the economizer 14, the remaining three sides of the condenser 3 are respectively connected to one side of the hot water circulation pump 10, the water tank 12 and one side of the liquid storage tank 4, the other side of the hot water circulation pump 10 is respectively connected to the water tank 12 and The cold water inlet 11 is connected, and a hot water outlet 13 is provided on the water tank 12. The other three sides of the economizer 14 are respectively connected to the other side of the liquid storage tank 4, port a and port d, port c is respectively connected to the first evaporator 71 and the fourth evaporator 74, and port b is respectively connected to the second evaporator 72 and the third evaporator 73. The first evaporator 71, the second evaporator 72, the third evaporator 73 and the fourth evaporator 74 are all connected to different filters 5. The filter 5 of the first evaporator 71 and the filter 5 of the second evaporator 72 are connected by a throttle valve 6, and the filter 5 of the third evaporator 73 and the filter 5 of the fourth evaporator 74 are connected by another throttle valve 6.

[0022] In a further solution of this embodiment, the throttle valve 6 is an expansion valve, which has a good throttling effect, low cost and is easy to replace.

[0023] In a further solution of this embodiment, the filter 5 is a drying filter, and the desiccant of the drying filter is granular silica gel, which is convenient for repeated use after heating, thereby ensuring that the filter 5 can continue to filter.

[0024] A working process of an ultra-efficient air source heat pump system includes the following steps: 1. When frost forms on the surfaces of the second evaporator 72 and the third evaporator 73, the high-temperature and high-pressure medium in the compressor 1 enters the condenser and heats the heat exchange medium in the condenser 3. The heated heat exchange medium enters the economizer 14 through the liquid storage tank 4, and can return air to the compressor 1 and exchange heat. The heat exchange medium in the economizer 14 enters the four-way reversing valve 2. When the four-way reversing valve 2 is not energized, the heat exchange medium flows from port b to the second evaporator 72 and the third evaporator 73 at the same time, thereby dissipating heat or defrosting the second evaporator 72 and the third evaporator 73 with waste heat. The heat exchange medium flowing out of the second evaporator 72 and the third evaporator 73 is throttled by the filter 5 and the throttle valve 6 and then flows to the first evaporator 71 and the fourth evaporator 74 respectively for evaporation and heat absorption. The heat exchange medium after evaporation and heat absorption merges together and flows to port c of the four-way reversing valve 2. Then, it flows from port d of the four-way reversing valve 2 through the economizer 14 and the gas-liquid separator 9 back to the compressor 1, and can be compressed and circulated again to achieve the heating purpose. 2. When frost forms on the surfaces of the first evaporator 71 and the fourth evaporator 74, the four-way reversing valve 2 is energized and switches the flow direction. The heat exchange medium flows from the port c of the four-way reversing valve 2 to the first evaporator 71 and the fourth evaporator 74 at the same time, thereby dissipating heat or defrosting the first evaporator 71 and the fourth evaporator 74 with waste heat. The heat exchange medium flowing out of the first evaporator 71 and the fourth evaporator 74 is throttled by the filter 5 and the throttle valve 6 and flows to the second evaporator 72 and the third evaporator 73 respectively for evaporation and heat absorption. The heat exchange medium after evaporation and heat absorption merges together and flows to the port b of the four-way reversing valve 2, and then flows from the port d of the four-way reversing valve 2 through the economizer 14 and the gas-liquid separator 9 back to the compressor 1, and can be compressed and circulated again to achieve the heating purpose.

[0025] It should be noted that, in the present invention, unless otherwise expressly specified or limited, the terms "fixed" and "disposed" should be understood in a broad sense. For example, they can refer to welded connections, bolted connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise expressly specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0026] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. An ultra-high efficiency air source heat pump system, comprising a compressor, an economizer, a condenser, a four-way reversing valve and four sets of evaporators, characterized in that: The four groups of evaporators include a first evaporator, a second evaporator, a third evaporator and a fourth evaporator. The four-way reversing valve is provided with ports a, b, c and d. Both sides of the compressor are connected to one side of the condenser and one side of the gas-liquid separator respectively. The other side of the gas-liquid separator is connected to one side of the economizer. The remaining three sides of the condenser are connected to one side of the hot water circulation pump, the water tank and one side of the liquid storage tank respectively. The other side of the hot water circulation pump is connected to the water tank and the cold water inlet respectively. A hot water outlet is provided on the water tank. The remaining three sides of the economizer are connected to the other side of the liquid storage tank, port a and port d respectively. Port c is connected to the first evaporator and the fourth evaporator respectively. Port b is connected to the second evaporator and the third evaporator respectively. The first evaporator, the second evaporator, the third evaporator and the fourth evaporator are all connected with different filters. The filter of the first evaporator and the filter of the second evaporator are connected by a throttle valve, and the filter of the third evaporator and the filter of the fourth evaporator are connected by another throttle valve.

2. The ultra-high efficiency air source heat pump system according to claim 1, characterized in that: The first evaporator, the second evaporator, the third evaporator and the fourth evaporator are all connected to different fans.

3. The ultra-high efficiency air source heat pump system according to claim 2, characterized in that: The fan is an axial flow fan.

4. The ultra-high efficiency air source heat pump system according to claim 1, characterized in that: A throttle is installed at the outlet of the compressor.

5. The ultra-high efficiency air source heat pump system according to claim 1 or 4, characterized in that: The throttle valve is an expansion valve.

6. The ultra-high efficiency air source heat pump system according to claim 1, characterized in that: The filter adopts a drying filter, and the desiccant of the drying filter is granular silica gel.

7. A working process of an ultra-high efficiency air source heat pump system, characterized in that: The following steps are involved:

1. When frost forms on the surfaces of the second and third evaporators, the high-temperature and high-pressure medium in the compressor enters the condenser and heats the heat exchange medium in the condenser. The heated heat exchange medium enters the economizer through the liquid storage tank. The heat exchange medium in the economizer enters the four-way reversing valve. When the four-way reversing valve is not energized, the heat exchange medium flows from port b to the second and third evaporators at the same time. The heat exchange medium flowing out of the second and third evaporators is throttled by the filter and the throttle valve and flows to the first and fourth evaporators respectively for evaporation and heat absorption. The heat exchange mediums after evaporation and heat absorption merge together and flow to port c of the four-way reversing valve. Then, they flow from port d of the four-way reversing valve through the economizer and the gas-liquid separator back to the compressor.

2. When frost forms on the surfaces of the first and fourth evaporators, the four-way reversing valve is energized and switches the flow direction. The heat exchange medium flows from port C of the four-way reversing valve to the first and fourth evaporators at the same time. The heat exchange medium flowing out of the first and fourth evaporators is throttled by the filter and the throttle valve and then flows to the second and third evaporators respectively for evaporation and heat absorption. The heat exchange medium after evaporation and heat absorption merges together and flows to port B of the four-way reversing valve, and then flows from port D of the four-way reversing valve through the economizer and the gas-liquid separator back to the compressor.

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