Heat pump system for heat supply

Abstract

The utility model provides a heat pump system for heat supply. The heat pump system comprises a heat source for providing heat; the heat pump unit comprises a compressor, a condenser provided with a first branch and a second branch which can exchange heat, an expansion valve and an evaporator at least provided with a third branch; the heat source is in fluid communication with the evaporator; the heat supply water side comprises a heat supply electromagnetic valve, a heat supply pipeline and a heat supply water pump, the second branch, the heat supply electromagnetic valve and the heat supply pipeline are in fluid communication in sequence and form a heat supply loop allowing heat supply water to flow circularly, and the heat supply water pump is arranged on the heat supply loop; the domestic hot water side comprises a hot water electromagnetic valve, a hot water pump, a water storage tank and a hot water output end which are sequentially in fluid communication, and the hot water electromagnetic valve is located on the downstream of the second branch and is in fluid communication with the second branch; the heat pump system is provided with a water return path communicated with the water storage tank and the heating loop, and the water return path is provided with a water return pump and a water return electromagnetic valve capable of being selectively opened and closed.

Description

Technical Field

[0001] The utility model relates to the technical field of heat pumps, in particular to a heat pump system for heating. Background Art

[0002] Buildings in colder regions (such as northern my country) have significant winter heating needs. This demand includes both heating water for the building and domestic hot water for showering, washing dishes, and other daily necessities. Prior art heat pump systems utilize heat pumps to provide both heating water and domestic hot water. These systems are particularly well-suited for buildings with high concentrations of people, such as supermarkets and hotels.

[0003] Generally speaking, heating water and domestic hot water usage differ during different time periods. Heating water needs to be available around the clock, while domestic hot water is primarily needed in the morning, evening, and during mealtimes. Consequently, heat pump systems are typically equipped with a water tank that can temporarily store a certain amount of domestic hot water, minimizing the cost of the heat pump system while still meeting domestic hot water demand. However, in actual use, due to cold outside temperatures, the domestic hot water in the water tank drops significantly in temperature after prolonged storage (such as during nighttime and weekday working hours when heat demand is lower), making it difficult for the water temperature to meet user requirements. Utility Model Content

[0004] In response to the technical problem in the above-mentioned prior art that the temperature of the domestic hot water in the water tank of the heat pump system drops significantly after being stored for a long time, and the water temperature is difficult to meet the user's usage requirements, the purpose of this utility model is to provide a heat pump system that can maintain the temperature of the domestic hot water in the water tank at a low cost.

[0005] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions: a heat pump system for heating, comprising: a heat source for providing heat; a heat pump unit, comprising a compressor, a condenser having a first branch and a second branch for heat exchange, an expansion valve and an evaporator having at least a third branch, the compressor, the first branch, the expansion valve and the third branch being fluidly connected in sequence and forming an internal circulation loop for circulating a heat transfer medium; the heat source is fluidly connected to the evaporator to provide heat to the heat pump unit; the heating water side comprises a heating solenoid valve, a heating pipe and a heating water supply. The water pump, the second branch, the heating solenoid valve and the heating pipe are fluidically connected in sequence and constitute a heating circuit for circulating heating water, and the heating water pump is arranged on the heating circuit; and the domestic hot water side, including a hot water solenoid valve, a hot water pump, a water tank and a hot water output end that are fluidically connected in sequence, and the hot water solenoid valve is located downstream of the second branch and fluidically connected to the second branch; wherein the heat pump system forms a return water path connecting the water tank and the heating circuit, and the return water path is equipped with a return water pump and a return water solenoid valve that can be selectively opened and closed.

[0006] In the above technical solution, preferably, the heat pump system further includes a water replenishment pump and a water replenishment input for providing replenishment water, wherein the water replenishment input, the water replenishment pump, and the second branch are sequentially fluidically connected. Further preferably, a water purifier is disposed between the water replenishment pump and the water replenishment input.

[0007] In the above technical solution, preferably, the water storage tank is equipped with a thermometer, and the return water pump and the return water solenoid valve are both signal-connected to the thermometer and can be selectively started based on the signal from the thermometer.

[0008] In the above technical solution, preferably, the water tank is also equipped with a water level gauge, the hot water pump signal is connected to the water level gauge and can be selectively started and shut down based on the signal of the water level gauge to deliver domestic hot water to the water tank.

[0009] In the above technical solution, preferably, the domestic hot water side further includes an electric water heater located between the water storage tank and the hot water output end. Further preferably, the domestic hot water side is further configured with a bypass solenoid valve, forming a bypass between the water storage tank and the hot water output end for domestic hot water to bypass the electric water heater, and the bypass solenoid valve is configured on the bypass.

[0010] In the above technical solution, preferably, the heating water pump is arranged downstream of the heating pipe.

[0011] In the above technical solution, preferably, the return water path is connected to the downstream of the heating pipe.

[0012] In the above technical solution, preferably, the heat source is a geothermal well, the evaporator further includes a fourth branch capable of performing heat exchange with the third branch, and the geothermal well fluid is connected to the fourth branch.

[0013] Compared to existing technologies, the heat pump system provided by this utility model can activate the return water solenoid valve and return water pump after the domestic hot water in the water tank has been stored for a long time, returning the lower-temperature domestic hot water to the heating circuit. At the same time, the hot water pump starts to replenish the higher-temperature domestic hot water in the water tank, thereby maintaining the water temperature in the water tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a system diagram of the heat pump system for heating provided by the utility model.

[0015] Note in the figure:

[0016] heat pump systems;

[0017] Geothermal well; 11. Geothermal well water pump;

[0018] Compressor; 22. Condenser; 23. Expansion valve; 24. Evaporator;

[0019] Heating solenoid valve; 32. Heating pipe; 33. Heating water pump;

[0020] Hot water solenoid valve; 42. Hot water pump; 43. Water storage tank; 44. Hot water output terminal; 45. Return water solenoid valve; 46. Return water pump; 47. Electric heater; 48. Bypass solenoid valve;

[0021] 51. Water supply input terminal; 52. Water supply pump; 53. Water purifier. DETAILED DESCRIPTION

[0022] In order to explain the technical content, structural features, achieved objectives and effects of this application in detail, the technical solutions in the embodiments of this application will be described below in conjunction with the drawings in the embodiments of this application.

[0023] In this application, spatially relative terms such as "under," "beneath," "under," "down," "over," "up," "above," "higher," "side" (e.g., as in "sidewall"), etc., are used to describe the relationship of one element to another (other) element as shown in the accompanying drawings. Spatially relative terms are intended to encompass different orientations of the device in use, operation, and / or manufacture in addition to the orientation depicted in the accompanying drawings. For example, if the device in the drawings is turned over, an element described as "under" or "beneath" other elements or features would then be positioned "over" the other elements or features. Thus, the exemplary term "under" can include both above and below orientations. Furthermore, the device can be positioned otherwise (e.g., rotated 90 degrees or at other orientations), and as such, the spatially relative descriptors used herein should be interpreted accordingly.

[0024] In this application, the terms "upstream" and "downstream" respectively mean that one component is located upstream or downstream of another component with respect to the flow direction of the corresponding fluid. For example, "the hot water solenoid valve is located downstream of the second branch" means that the hot water solenoid valve is located downstream of the second branch with respect to the flow direction of domestic hot water.

[0025] The present invention provides a heat pump system 100 for heating, which aims to maintain the water temperature of domestic hot water in a water tank 43 at a low cost, so that users can still use domestic hot water conveniently after a long interval. Figure 1 As shown, the heat pump system 100 includes a geothermal well 1 used as a heat source, a heat pump unit for utilizing the heat of the geothermal well 1, a heating water side for providing heating water to the building, a domestic hot water side for providing domestic hot water to the building, and a water replenishment side for replenishing water to the heat pump system 100.

[0026] To facilitate the description of heat pump system 100, the following first introduces a heat pump unit. A heat pump unit is a highly efficient, energy-saving device that fully utilizes low-grade thermal energy. Based on the reverse Carnot cycle, it transfers a portion of the heat from an external heat source (such as air, water, or geothermal energy, in this embodiment, groundwater in geothermal well 1) to heating water and domestic hot water through a small amount of work.

[0027] Specifically, as shown in the figure, the heat pump unit includes a compressor 21, a condenser 22, an expansion valve 23 and an evaporator 24. The condenser 22 has a first branch (not marked in the figure) and a second branch (not marked in the figure) for heat exchange, and the evaporator 24 has a third branch (not marked in the figure) and a fourth branch (not marked in the figure) for heat exchange. The compressor 21, the first branch of the condenser 22, the expansion valve 23 and the third branch of the evaporator 24 are fluidically connected in sequence and form an internal circulation loop for the circulation of the heat transfer medium.

[0028] Among them, the compressor 21 can compress the high-temperature, low-pressure heat transfer medium into a high-temperature, high-pressure heat transfer medium and provide the heat transfer medium with power to circulate in the internal circulation loop; the condenser 22 allows the heat transfer medium to exchange heat with the heating water and domestic hot water, and allows the high-temperature, high-pressure heat transfer medium to release heat to the outside and then be converted into a low-temperature, high-pressure heat transfer medium; the expansion valve 23 can convert the low-temperature, high-pressure heat transfer medium into a low-temperature, low-pressure heat transfer medium through the throttling effect; finally, the evaporator 24 allows the low-temperature, low-pressure heat transfer medium to exchange heat with the groundwater and be converted into a high-temperature, low-pressure heat transfer medium. Thus, through the above cycle, the heat transfer medium in the internal circulation loop transfers part of the heat of the groundwater to the heating water and domestic hot water for users to use.

[0029] Continue reading Figure 1 This embodiment uses geothermal wells 1 as the heat source for heat pump system 100. Geothermal wells 1 are drilled underground using large drilling rigs. The bottom of each well provides groundwater at a temperature above 50°C. Heat pump system 100 utilizes a closed water cycle to utilize the geothermal source, achieving the goal of extracting heat without using water, minimizing environmental impact.

[0030] Specifically, a heat source-side loop for groundwater circulation is formed between geothermal well 1 and the aforementioned fourth branch. Heat pump system 100 also includes a geothermal well pump 11 within this heat source-side loop, providing motive force for the groundwater's flow. As can be understood, groundwater at the bottom of geothermal well 1, pumped by geothermal well pump 11, reaches the fourth branch and releases heat. Subsequently, the cooled groundwater returns to the surface of geothermal well 1, completing a closed loop.

[0031] In other embodiments, factory wastewater, air source, etc. may also be used as the heat source of the heat pump unit. When air source is used as the heat source, the heat pump unit adopts an air source heat pump, and its evaporator is only equipped with a third circuit for heat exchange with ambient air.

[0032] The heating water supply side includes a heating solenoid valve 31, heating pipes 32 installed on the building, and a heating water pump 33 that provides flow power for the heating water. The second branch of the condenser 22, the heating solenoid valve 31, and the heating pipes 32 are fluidically connected in sequence, forming a heating circuit for the circulation of heating water. The heating solenoid valve 31 is used to selectively open and close the heating circuit (for example, in the summer, when only domestic hot water is required and no heating water is needed, the heating solenoid valve 31 can be closed and the hot water solenoid valve 41 (described below) can be opened to meet the user's domestic hot water demand). The heating water pump 33 is installed in this heating circuit.

[0033] As can be understood, the heat transfer medium within the heat pump unit transfers some of the heat it receives from the groundwater to the heating water in the second branch of condenser 22. Under the suction of heating water pump 33, the heat transfer water in the second branch flows through heating solenoid valve 31 to heating pipe 32, where it is heated. The cooled heating water then flows back into the second branch, completing a complete cycle.

[0034] Furthermore, the heating water pump 33 is arranged downstream of the heating pipe 32, where the water temperature is lower, which can reduce the possibility of cavitation of the heating water pump 33.

[0035] The domestic hot water system includes a hot water solenoid valve 41, a hot water pump 42 that provides flow power for the domestic hot water, a water tank 43 that can temporarily store a certain amount of domestic hot water, and a hot water output port 44. The hot water output port 44 is connected downstream to various heat-using devices within the building (such as showers and kitchen appliances). The hot water solenoid valve 41 is located downstream of the second branch of the condenser 22 and is fluidically connected to this second branch. The hot water solenoid valve 41 selectively opens and closes the fluid path between the second branch and the water tank 43. The water tank 43 is used to store a certain amount of domestic hot water to meet user domestic hot water needs while reducing the output of the heat pump unit (i.e., reducing the cost of the heat pump unit).

[0036] Considering that the domestic hot water in the water tank 43 will drop in temperature after long-term storage and may not meet the user's water temperature requirements, the heat pump system 100 provided by the present invention forms a return water path between the water tank 43 and the heating circuit. The return water path is equipped with a return water pump 46 that can pump domestic hot water from the water tank 43 to the heating circuit, and a return water solenoid valve 45 that can selectively open and close the return water path.

[0037] Therefore, when the water temperature in water tank 43 drops to a certain level, return solenoid valve 45 and return pump 46 are opened to pump some of the domestic hot water in tank 43 into the heating circuit. This domestic hot water eventually flows to the second branch, where its temperature rises. Simultaneously, hot water pump 42 is activated to replenish the water tank 43 with warmer domestic hot water, thereby maintaining the water temperature there.

[0038] Furthermore, the water replenishment path is connected to the downstream of the heating pipe 32 to prevent domestic hot water with reduced water temperature from flowing into the heating pipe 32 and affecting the heating effect.

[0039] Furthermore, the water tank 43 is provided with a thermometer (not marked in the figure) for monitoring the water temperature of the water tank 43. The return water solenoid valve 45 and the return water pump 46 are both connected to the thermometer by signal and are configured to be selectively opened and closed based on the signal of the thermometer to extract the domestic hot water with a lower temperature in the water tank 43.

[0040] Furthermore, the water tank 43 is also equipped with a water level gauge (not marked in the figure) for monitoring the water level of the water tank 43. The hot water pump 42 signal is connected to the water level gauge and is constructed to be selectively turned on and off based on the signal of the water level gauge to replenish the water tank 43 with higher temperature domestic hot water in a timely manner.

[0041] Furthermore, considering the possibility that the water temperature in the water tank 43 is low while the user is using domestic hot water, the domestic hot water in the water tank 43 may not be hot enough to meet the needs of users with higher water temperature requirements (such as dishwashers in the kitchen). To this end, this embodiment also includes an electric heater 47 between the water tank 43 and the hot water outlet 44 to increase the temperature of the domestic hot water.

[0042] Furthermore, considering that there is a large loss along the way when domestic hot water passes through the electric heater 47, a bypass (not marked in the figure) is formed between the water tank 43 and the hot water output end 44 of this embodiment for domestic hot water to bypass the electric heater 47. The bypass is also provided with a bypass solenoid valve 48 for opening and closing the bypass.

[0043] The water supply side includes a water supply input 51 for inputting water supply and a water supply pump 52 for providing flow power for the water supply. The water supply input 51, the water supply pump 52, and the heating circuit are fluidically connected in sequence. Thus, the water supply side can promptly replenish lost domestic hot water to the heat pump system 100.

[0044] Furthermore, considering the water quality requirements for heating water and domestic hot water, the feed water system also includes a water purifier 53 disposed between the feed water input end 51 and the feed water pump 52 to purify the feed water input into the heat pump system 100 .

[0045] The above embodiments are intended only to illustrate the technical concepts and features of this application. Their purpose is to enable those familiar with the art to understand the content of this application and implement it accordingly. They are not intended to limit the scope of protection of this application. Any equivalent changes or modifications made in accordance with the spirit of this application shall be included in the scope of protection of this application.

Claims

1. A heat pump system for heating, characterized in that: include: A heat source that provides heat; A heat pump unit includes a compressor, a condenser having a first branch and a second branch capable of performing heat exchange, an expansion valve, and an evaporator having at least a third branch. The compressor, the first branch, the expansion valve, and the third branch are fluidically connected in sequence to form an internal circulation loop for circulating a heat transfer medium. The heat source is fluidically connected to the evaporator to provide heat to the heat pump unit. The heating water supply side includes a heating solenoid valve, a heating pipe, and a heating water pump. The second branch, the heating solenoid valve, and the heating pipe are fluidically connected in sequence to form a heating circuit for circulating heating water. The heating water pump is arranged on the heating circuit; and The domestic hot water side includes a hot water solenoid valve, a hot water pump, a water storage tank, and a hot water output end that are fluidically connected in sequence, wherein the hot water solenoid valve is located downstream of the second branch and is fluidically connected to the second branch; The heat pump system forms a water return path connecting the water storage tank and the heating circuit, and the water return path is provided with a water return pump and a water return solenoid valve that can be selectively opened and closed.

2. The heat pump system according to claim 1, characterized in that It also includes a water replenishment pump and a water replenishment input end for providing water replenishment, and the water replenishment input end, the water replenishment pump and the second branch are fluidically connected in sequence.

3. The heat pump system according to claim 2, characterized in that A water purifier is also arranged between the water replenishment pump and the water replenishment input end.

4. The heat pump system according to claim 1, characterized in that The water storage tank is equipped with a thermometer, and the return water pump and the return water solenoid valve are both connected to the thermometer by signal and can be selectively started based on the signal from the thermometer.

5. The heat pump system according to claim 1 or 4, characterized in that: The water tank is also equipped with a water level gauge. The hot water pump signal is connected to the water level gauge and can be selectively started and shut down based on the signal of the water level gauge to deliver domestic hot water to the water tank.

6. The heat pump system according to claim 1, characterized in that The domestic hot water side also includes an electric water heater located between the water storage tank and the hot water output end.

7. The heat pump system according to claim 6, characterized in that The domestic hot water side is also equipped with a bypass solenoid valve. A bypass is formed between the water storage tank and the hot water output end for domestic hot water to bypass the electric water heater. The bypass solenoid valve is arranged on the bypass.

8. The heat pump system according to claim 1, wherein: The heating water pump is arranged downstream of the heating pipe.

9. The heat pump system according to claim 1, characterized in that The return water path is connected to the downstream of the heating pipe.

10. The heat pump system according to claim 1, characterized in that The heat source is a geothermal well, and the evaporator further includes a fourth branch capable of performing heat exchange with the third branch, and the geothermal well fluid is connected to the fourth branch.

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