Domestic heating system

Abstract

The utility model relates to a kind of domestic heating system, comprising: heat pump unit, including compressor, condensing heat exchanger, throttling valve and evaporative heat exchanger, condensing heat exchanger has first branch and second branch;Heat transfer unit, including first switch valve, second switch valve, water storage tank and first circulating pump, water storage tank has heat supply inlet and return water outlet, first switch valve includes the first inlet of water replenishment, the first outlet of fluid communication second branch and the second inlet of fluid communication return water outlet, second switch valve includes the third inlet of fluid communication second branch, the second outlet of discharge and the third outlet of fluid communication heat supply inlet;Heat demand end, including several heat using equipment;Wherein, first switch valve has the water replenishment state of connecting first inlet and first outlet and the first circulation state of connecting second inlet and first outlet, second switch valve has the drainage state of connecting third inlet and second outlet and the second circulation state of connecting third inlet and third outlet.

Description

Technical Field

[0001] This utility model relates to the field of heating technology, and in particular to a household heating system using a heat pump. Background Technology

[0002] A heat pump unit is a highly efficient and energy-saving heating device that transfers a portion of the heat from the heat supply side to the heat demand side to provide users with heating or cooling. Heat pump units have many advantages, including high COP (typically 3-5), low carbon emissions and environmental friendliness, reliable operation, and wide applicability, and are increasingly widely used in heating, cooling, and hot water supply. Utility Model Content

[0003] The purpose of this invention is to provide a household heating system that uses a heat pump.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a household heating system, comprising: a heat pump unit, including a compressor, a condensing heat exchanger, a throttling valve, and an evaporating heat exchanger, wherein the condensing heat exchanger has a first branch and a second branch for heat exchange between the heat transfer medium and the heating water; the compressor, the first branch of the condensing heat exchanger, the throttling valve, and the evaporating heat exchanger are sequentially fluidly connected and form a heat pump loop for circulating the heat transfer medium; a heat transfer unit, including a first switching valve, a second switching valve, a water storage tank, and a first circulating pump, wherein the water storage tank has a heating inlet and a return outlet; the first switching valve includes a first inlet for external water supply, a first outlet fluidly connected to the second branch, and a second inlet fluidly connected to the return outlet; the second switching valve includes a third inlet fluidly connected to the second branch and a second outlet for external discharge of heating water. The system includes an outlet and a third outlet that is fluidly connected to the heating inlet; and a heat demand side, including several heat-using devices, which are fluidly connected to the water storage tank or can exchange heat with the heating water in the water storage tank; wherein, the first switching valve has a water replenishment state connecting the first inlet and the first outlet and a first circulation state connecting the second inlet and the first outlet, and the second switching valve has a drainage state connecting the third inlet and the second outlet and a second circulation state connecting the third inlet and the third outlet. When the first switching valve and the second switching valve are respectively in the first circulation state and the second circulation state, the first switching valve, the second branch of the condensing heat exchanger, the second switching valve, and the water storage tank are fluidly connected in sequence and form a heat transfer loop for circulating heat transfer water, and the first circulation pump is configured on the heat transfer loop.

[0005] In the above technical solution, preferably, the heat transfer unit further includes a low-level water level gauge and a high-level water level gauge, both disposed on the water storage tank. The high-level water level gauge is located above the low-level water level gauge, and the first switching valve and the second switching valve are both signal-connected to the low-level water level gauge and the high-level water level gauge. Further preferably, the heat transfer unit includes a water thermometer disposed on the water storage tank, and the compressor and the first circulating pump are both signal-connected to the water thermometer.

[0006] In the above technical solution, preferably, the heat transfer unit further includes a drain gate disposed at the bottom of the water storage tank.

[0007] In the above technical solution, preferably, the heat demand side further includes a booster pump, and the water storage tank has a heating outlet for the outflow of heating water. The heating outlet, the booster pump, and the heat-using equipment are sequentially fluidly connected. Further preferably, the heat demand side also includes a third switching valve. The third switching valve has a fourth inlet fluidly connected to the booster pump, a fourth outlet fluidly connected to the heat-using equipment, and a fifth outlet fluidly connected to the water storage tank. The third switching valve has a heating state connecting the fourth inlet and the fourth outlet, and a third circulation state connecting the fourth inlet and the fifth outlet.

[0008] In the above technical solution, preferably, the heat transfer unit further includes a heat exchange coil disposed inside the water storage tank, and the heat demand side further includes a second circulation pump. The heat-using equipment is in fluid communication with the heat exchange coil to form a demand-side loop that allows water to circulate at the demand side, and the second circulation pump is disposed on the demand-side loop.

[0009] In the above technical solution, preferably, the heat transfer medium is carbon dioxide fluid.

[0010] This utility model provides a domestic heating system that includes a heat transfer unit between a heat pump unit and the heat demand side. The heat transfer unit has a storage tank capable of storing a certain amount of heating water. Heating water is replenished by setting a first switching valve and a second switching valve to a water supply state and a second circulation state. The water temperature in the storage tank is gradually increased by setting the first and second switching valves to the first and second circulation states respectively and starting the first circulation pump. Heating water is gradually discharged by setting the first and second switching valves to the first circulation state and the drainage state respectively. With the flexible configuration of the first and second switching valves, this domestic heating system can achieve various operating conditions, including starting heating, maintaining water temperature, and stopping drainage. Attached Figure Description

[0011] Figure 1 This is a system diagram of the domestic heating system provided in this application; the arrows in the diagram indicate the flow direction of fluid in the circuit or pipe at that location.

[0012] The image is labeled as follows: 100. Household heating system; 10. Primary heat-consuming equipment; 20. Secondary heat-consuming equipment; 11. Compressor; 12. Condensing heat exchanger; 13. Expansion valve; 14. Evaporating heat exchanger; 141. Convection fan; 21. First switching valve; 22. Second switching valve; 23. Water storage tank; 231. Inner cavity; 232. Heat exchange coil; 24. First circulating pump; 25. Low-level water level gauge; 26. High-level water level gauge; 27. Water thermometer; 28. Water discharge gate; 31. Booster pump; 32. Third switching valve; 33. Second circulation pump. Detailed Implementation

[0013] To explain in detail the technical content, structural features, achieved objectives and effects of this application, the technical solutions in the embodiments of this application will be described below with reference to the accompanying drawings.

[0014] In this application, spatial relative terms such as “below,” “under,” “below,” “down,” “above,” “above,” “higher,” and “side” (e.g., as in a “sidewall”) are used to describe the relationship between one element and another (other) element as shown in the accompanying drawings. Spatial relative terms are intended to include different orientations of the device in use, operation, and / or manufacture other than those depicted in the drawings. For example, if the device in the drawings is flipped, an element described as “below” or “under” another element or feature would then be positioned “above” said other element or feature. Thus, the exemplary term “below” can include both above and below orientations. Furthermore, the device may be otherwise positioned (e.g., rotated 90 degrees or in other orientations), thus interpreting the spatial relative descriptive terms used herein accordingly.

[0015] In this application, the term "fluid connectivity" refers to the existence of a fluid path between one fluid space (such as the internal space of a water tank, pipe, or pump) and another fluid space, allowing fluid to flow between them. It is understood that "fluid connectivity" in this application includes both direct communication between two fluid spaces and communication via several third fluid spaces. Furthermore, in this application, "fluid connectivity" refers to a simplified description of fluid connectivity between the internal fluid spaces of two devices (such as a pump or other equipment).

[0016] In this application, the term "heating equipment" means equipment that provides hot water or heat to users to meet their daily living needs, such as shower heads, faucets, bathtubs, underfloor heating pipes, etc.

[0017] This application provides a domestic heating system 100 to provide hot water or heat for users' daily home life. Specifically, as shown in the figure... Figure 1 As shown, the household heating system 100 includes a heat pump unit for providing heat, a heat transfer unit for temporarily storing and insulating heating water, and a heat demand end equipped with a first heat-using device 10 and a second heat-using device 20.

[0018] The heat pump unit includes a compressor 11, a condenser heat exchanger 12, a throttling valve 13, and an evaporator heat exchanger 14. The condenser heat exchanger 12 has a first branch (not shown in the figure) and a second branch (not shown in the figure) for heat exchange between the heat transfer medium and the heating water. The compressor 11, the first branch of the condenser heat exchanger 12, the throttling valve 13, and the evaporator heat exchanger 14 are sequentially fluidly connected and form a heat pump loop for the circulation of the heat transfer medium.

[0019] The compressor 11 compresses the heat transfer medium with a certain degree of superheat into a high-temperature and high-pressure fluid, and provides the power for the heat transfer medium to circulate in the heat pump circuit; the condenser heat exchanger 12 allows the heat transfer medium to exchange heat with the heating water, so that some of the heat of the heat transfer medium is transferred to the heating water; the throttling valve 13 can reduce the fluid pressure of the heat transfer medium through the throttling effect; finally, the evaporator heat exchanger 14 allows the low-temperature and low-pressure heat transfer medium to absorb heat from the heat source.

[0020] The evaporative heat exchanger 14 provided in this embodiment is an air source heat exchanger (i.e., the heat pump unit is an air source heat pump unit), and it is equipped with a convection fan 141 for forced convection to improve heat exchange efficiency. It is understood that in other embodiments, a water source heat pump unit or a geothermal source heat pump unit may be used instead of the air source heat pump unit of this embodiment.

[0021] Furthermore, in this embodiment, the heat transfer medium of the heat pump unit is carbon dioxide fluid (i.e., the heat pump unit is a carbon dioxide heat pump). This type of heat pump unit has many advantages, such as strong environmental friendliness (global warming potential GWP is only 1), stable chemical properties (non-toxic, non-flammable, and non-explosive), wide operating temperature range (-40℃ to 120℃), and high energy efficiency ratio (COP can reach 4.0 or above). It is suitable for heating ordinary households, especially for households in northern my country where the annual temperature range is large.

[0022] Continue reading Figure 1 The heat transfer unit includes a first switching valve 21, a second switching valve 22, a water storage tank 23 capable of storing a certain amount of heating water, and a first circulating pump 24.

[0023] The first switching valve 21 has a first inlet (not shown in the figure) for supplying water, a first outlet (not shown in the figure) for fluid communication with the second branch of the condenser heat exchanger 12, and a second inlet (not shown in the figure) for fluid communication with the return water port (see below) of the water storage tank 23. The first switching valve 21 has a water supply state with the first inlet and the first outlet connected, and a first circulation state with the second inlet and the first outlet connected.

[0024] The second switching valve 22 has a third inlet (not shown in the figure) of the second branch of the condensing heat exchanger 12, a second outlet for discharging heating water, and a heating inlet (see below) and a third outlet (not shown in the figure) of the water storage tank 23. The second switching valve 22 has a drainage state that connects the third inlet and the second outlet, and a second circulation state that connects the third inlet and the third outlet.

[0025] The water storage tank 23 has an inner cavity 231 for storing heating water and has a heating inlet for the inflow of heating water, a heating outlet for the outflow of heating water, and a return outlet for the return of heating water to the first switching valve 21. When the first switching valve 21 and the second switching valve 22 are in the first circulation state and the second circulation state, respectively, the first switching valve 21, the second branch of the condenser heat exchanger 12, the second switching valve 22, and the water storage tank 23 are sequentially fluidly connected and form a heat transfer loop for the circulating flow of heating water. The first circulation pump 24 is disposed on this heat transfer loop to provide flow power for the heating water.

[0026] The heat transfer unit provided in this embodiment has a heating mode, a heat preservation mode, and a drainage mode. The heating mode is mainly used when the water level in the storage tank 23 is low (such as during the initial startup of a domestic heating system 100) to produce heating water. In this mode, the compressor 11 of the heat pump unit starts, and the first switching valve 21 and the second switching valve 22 are in the water supply state and the second circulation state, respectively. The external water supply flows into the heat transfer circuit through the first inlet of the first switching valve 21, is heated in the condenser heat exchanger 12, and then flows into the storage tank 23 through the second switching valve 22.

[0027] Understandably, during the initial startup of the heat pump unit, the outlet water temperature of the second branch of the condenser heat exchanger 12 may be low and not meet the water temperature requirements for heating. In this case, the second switching valve 22 can be switched to the drainage state, and after the outlet water temperature meets the requirements, the second switching valve 22 can be switched to the second circulation state; alternatively, when the water level in the storage tank 23 is high, the water temperature for heating can be gradually increased through the following insulation mode.

[0028] The heat preservation mode is used to maintain the water temperature of the heating water in the storage tank 23. In this mode, the compressor 11 of the heat pump unit and the first circulation pump 24 of the heat transfer unit are both started. The first switching valve 21 and the second switching valve 22 are in the first circulation state and the second circulation state, respectively. The heating water in the storage tank 23 circulates in the heat transfer loop under the action of the first circulation pump 24. The heating water is continuously heated by the condenser heat exchanger 12, so that the water temperature in the storage tank 23 gradually increases until the requirement is met.

[0029] The discharge mode is suitable for situations where the domestic heating system 100 is not used for an extended period. In this mode, the heat pump unit stops operating, and the first circulation pump 24 of the heat transfer unit starts. The first switching valve 21 and the second switching valve 22 are in the first circulation state and the discharge state, respectively. The heating water in the storage tank 23 is gradually discharged through the second switching valve 22 under the action of the first circulation pump 24. Subsequently, the domestic heating system 100 can choose whether to produce new heating water for the storage tank 23 as needed.

[0030] Furthermore, the heat transfer unit is also equipped with a low-level water level gauge 25 located on the water storage tank 23 and a high-level water level gauge 26 located above the low-level water level gauge 25. Both the low-level water level gauge 25 and the high-level water level gauge 26 can emit a signal when the water level in the water storage tank 23 reaches the corresponding height. The first and second switching valves are both connected to the low-level water level gauge 25 and the high-level water level gauge 26 to replenish or drain water in a timely manner according to the water level.

[0031] Furthermore, the heat transfer unit is also equipped with a water thermometer 27 located on the water storage tank 23. The water thermometer 27 can monitor the temperature inside the water storage tank 23 and send corresponding signals to the outside. The compressor 11 and the first circulation pump 24 are both connected to the aforementioned water thermometer 27 to heat the heating water in a timely manner according to the water temperature of the heating water.

[0032] Furthermore, a drain gate 28 with fluid communication to the inner cavity 231 is also provided at the bottom of the water storage tank 23 to completely drain the heating water in the water storage tank 23 in case of cleaning of the water storage tank 23, maintenance of the domestic heating system 100, or leakage in the heat transfer circuit.

[0033] The heat demand side of this application also includes a booster pump 31, and the heating outlet of the water storage tank 23, the booster pump 31, and the first heat-using device 10 are sequentially fluidly connected. It can be understood that when the booster pump 31 is started, the heating water in the water storage tank 23 flows to the first heat-using device 10 to provide heating water to the user.

[0034] Furthermore, considering that the pipeline between the first heating device 10 and the water storage tank 23 may be relatively long, after the first heating device 10 is not used for a period of time (such as when using a shower head with long intervals), the heated water in the pipeline between the first heating device 10 and the water storage tank 23 will experience a significant temperature drop, causing discomfort to the user. Therefore, a third switching valve 32 is provided. This third switching valve 32 has a fourth inlet (not shown in the figure) fluidly connected to the booster pump 31, a fourth outlet (not shown in the figure) fluidly connected to the first heating device 10, and a fifth outlet (not shown in the figure) fluidly connected to the water storage tank 23.

[0035] The third switching valve 32 has a heating state that connects the fourth inlet and the fourth outlet, and a third circulation state that connects the fourth inlet and the fifth outlet. Understandably, after the first heating device 10 has not been used for a long time, the third switching valve 32 can be set to the third circulation state and the booster pump 31 can be started to allow some of the heating water between the water storage tank 23 and the first heating device 10 to flow back and replenish with new high-temperature heating water, thereby reducing user discomfort during use.

[0036] The aforementioned first heating device 10 can be a device that directly uses heated water, such as a showerhead or faucet. However, in practical applications, some heating devices (such as bathtubs) have certain requirements for water quality and are not suitable for direct use of heated water. Therefore, this embodiment illustrates a second heating device 20 and provides the following technical solution: The water storage tank 23 of the heat transfer unit is also equipped with a heat exchange coil 232 for heat exchange between the demand-side water and the heated water. The second heating device 20 is fluidly connected to the heat exchange coil 232, forming a heat demand-side loop for the circulating flow of demand-side water. A second circulation pump 33 located in the aforementioned heat demand-side loop is also configured at the heat demand end. Understandably, the domestic heating system 100 can activate the second circulation pump 33 to allow the fluid in the second heating device 20 to exchange heat with the heated water, thereby increasing the temperature of the demand-side water.

[0037] The above embodiments are only for illustrating the technical concept and features of this application, and are intended to enable those skilled in the art to understand the content of this application and implement it accordingly. They should not be construed as limiting the scope of protection of this application. All equivalent changes or modifications made in accordance with the spirit of this application should be included within the scope of protection of this application.

Claims

1. A household heating system, characterized in that, include: A heat pump unit includes a compressor, a condenser heat exchanger, a throttling valve, and an evaporator heat exchanger. The condenser heat exchanger has a first branch and a second branch for heat exchange between the heat transfer medium and the heating water. The compressor, the first branch of the condenser heat exchanger, the throttling valve, and the evaporator heat exchanger are sequentially fluidly connected and form a heat pump loop for circulating heat transfer medium. A heat transfer unit includes a first switching valve, a second switching valve, a water storage tank, and a first circulating pump. The water storage tank has a heating inlet and a return outlet. The first switching valve includes a first inlet for external water supply, a first outlet fluidly connected to the second branch, and a second inlet fluidly connected to the return outlet. The second switching valve includes a third inlet fluidly connected to the second branch, a second outlet for external discharge of heating water, and a third outlet fluidly connected to the heating inlet. as well as The heat demand side includes several heat-using devices, which are in fluid communication with the water storage tank or can exchange heat with the heating water in the water storage tank. The first switching valve has a water replenishment state connecting the first inlet and the first outlet, and a first circulation state connecting the second inlet and the first outlet. The second switching valve has a drainage state connecting the third inlet and the second outlet, and a second circulation state connecting the third inlet and the third outlet. When the first switching valve and the second switching valve are respectively in the first circulation state and the second circulation state, the first switching valve, the second branch of the condenser heat exchanger, the second switching valve, and the water storage tank are sequentially fluidly connected and form a heat transfer loop for circulating heat transfer water. The first circulation pump is configured on the heat transfer loop.

2. The domestic heating system according to claim 1, characterized in that, The heat transfer unit also includes a low-level water level gauge and a high-level water level gauge, both of which are configured on the water storage tank. The high-level water level gauge is located above the low-level water level gauge. The first switching valve and the second switching valve are both signal connected to the low-level water level gauge and the high-level water level gauge.

3. The domestic heating system according to claim 1 or 2, characterized in that, The heat transfer unit includes a water thermometer mounted on the water storage tank, and both the compressor and the first circulation pump are signal-connected to the water thermometer.

4. The domestic heating system according to claim 1, characterized in that, The heat transfer unit also includes a drain gate located at the bottom of the water storage tank.

5. The domestic heating system according to claim 1, characterized in that, The heat demand side also includes a booster pump, and the water storage tank has a heat supply outlet for the water to flow out. The heat supply outlet, the booster pump, and the heat-using equipment are connected in sequence.

6. The domestic heating system according to claim 5, characterized in that, The heat demand side also includes a third switching valve, which has a fourth inlet fluidly connected to the booster pump, a fourth outlet fluidly connected to the heat-using equipment, and a fifth outlet fluidly connected to the water storage tank. The third switching valve has a heat-using state that connects the fourth inlet and the fourth outlet, and a third circulation state that connects the fourth inlet and the fifth outlet.

7. The domestic heating system according to claim 1, characterized in that, The heat transfer unit also includes a heat exchange coil disposed inside the water storage tank, and the heat demand side also includes a second circulation pump. The heat-using equipment is in fluid communication with the heat exchange coil to form a demand-side loop that allows water to circulate at the demand side, and the second circulation pump is disposed on the demand-side loop.

8. The domestic heating system according to claim 1, characterized in that, The heat transfer medium is carbon dioxide fluid.

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