Heat pump system with heat recovery function

Abstract

The utility model discloses a heat pump system with heat recovery, which comprises an electric valve, an economizer, a throttling device, a compressor and three heat exchangers, and can realize efficient switching between a refrigerating mode and a heating mode, in the refrigerating mode, a refrigerant passes through a first heat exchanger, the electric valve, a third heat exchanger, the economizer and a second heat exchanger and finally returns to the compressor, and the refrigerant returns to the compressor. A closed loop is formed. In a heating mode, the economizer is connected to a first input pipeline of the compressor, and a refrigerant flows through two different flowing directions: the first flowing direction passes through the first heat exchanger, the electric valve, the second heat exchanger, the economizer, the throttling device and the economizer and then returns to the compressor; the second flow passes through the first heat exchanger, the electric valve, the second heat exchanger, the economizer and the third heat exchanger and finally returns to the compressor to form a closed loop. Compared with the prior art, the technical defect that heat discharged in the refrigerating process and excessive heat generated in the heating process are wasted is overcome.

Description

Technical Field

[0001] The utility model belongs to the technical field of heat pump systems, and in particular relates to a heat pump system with heat recovery. Background Art

[0002] Traditional energy heating and cooling methods, such as boilers and air conditioning systems that burn fossil fuels, not only consume a lot of energy, but also produce a lot of greenhouse gases and other pollutants during use, causing serious negative impacts on the environment. These traditional methods have relatively low energy conversion efficiency and strong dependence on natural resources, resulting in energy waste and unsustainable burden on the environment.

[0003] With the development of society and the advancement of science and technology, heat pump systems have emerged and have been widely used in the fields of refrigeration and heating. Compared with traditional methods, heat pump systems can reduce energy consumption by about 30% to 70%. In addition, since heat pump systems do not rely on direct combustion of fossil fuels, they greatly reduce greenhouse gas emissions and play a positive role in improving air quality and mitigating climate change.

[0004] However, heat pump systems still face challenges in certain applications. Traditional cooling and heating heat pump systems usually require independent equipment and energy input. This separate system design leads to repeated energy consumption and heat waste. Especially in the cooling process, a large amount of heat is discharged to the outside, which can actually be recycled. Similarly, in the heating process, the heat generated by the system often exceeds the actual demand for heating space, and this part of the excess heat is not fully utilized. This energy waste not only increases the energy cost of users, but also aggravates the impact on the environment. Utility Model Content

[0005] The purpose of the utility model is to solve the above technical problems and provide a heat pump system with heat recovery.

[0006] In order to solve the above problems, the utility model is implemented according to the following technical solutions:

[0007] In a first aspect, the utility model provides a heat pump system with heat recovery, comprising an electric valve, an economizer, a throttling device, a compressor, a first heat exchanger, a second heat exchanger and a third heat exchanger, wherein the throttling device comprises a first throttling member and a second throttling member; the compressor has a first output pipeline, a first input pipeline and a second input pipeline; the first heat exchanger is connected to an external water-using device, the first heat exchanger is connected to the first output pipeline of the compressor, and the first heat exchanger is connected to the electric valve through a pipeline; the second heat exchanger is connected to an external temperature control device, the second heat exchanger is connected to the economizer through a pipeline, and the second heat exchanger is connected to the electric valve through a pipeline; the third heat exchanger is connected to the economizer through a pipeline, and the third heat exchanger is connected to the electric valve through a pipeline;

[0008] The heat pump system has a refrigeration mode and a heating mode that can be switched between each other. In the refrigeration mode, the electric valve can make the refrigerant in the compressor flow along the first heat exchanger, the electric valve, the third heat exchanger, the second throttling device, the economizer, the second heat exchanger, the electric valve and the second input pipeline of the compressor, and finally return to the compressor to form a closed loop;

[0009] In the heating mode, the economizer is connected to the first input pipeline of the compressor, and the flow direction of the refrigerant in the compressor includes a first flow direction and a second flow direction. The electric valve can make the refrigerant in the compressor flow along the first heat exchanger, the electric valve, the second heat exchanger, the economizer, the first throttling device, the economizer and the first input pipeline of the compressor, and finally return to the compressor to form a closed loop; the electric valve can make the refrigerant in the compressor flow along the second flow direction of the first heat exchanger, the electric valve, the second heat exchanger, the economizer, the second throttling device, the third heat exchanger, the electric valve and the second input pipeline of the compressor, and finally return to the compressor to form a closed loop.

[0010] Preferably, the electric valve is provided with a first valve hole, a second valve hole, a third valve hole and a fourth valve hole; the economizer is provided with a first connecting hole, a second connecting hole, a third connecting hole and a fourth connecting hole; the first heat exchanger, the second heat exchanger and the third heat exchanger are all provided with a first pipe port and a second pipe port; the first pipe port of the first heat exchanger is connected to the first output pipe of the compressor, and the second pipe port of the first heat exchanger is connected to the first valve hole of the electric valve through a pipe; the first pipe port of the second heat exchanger is connected to the second valve hole of the electric valve through a pipe, and the second pipe port of the second heat exchanger is connected to the first connecting hole of the economizer through a pipe; the first pipe port of the third heat exchanger is connected to the fourth valve hole of the electric valve through a pipe, and the second pipe port of the third heat exchanger is connected to the second connecting hole of the economizer through a pipe; the second input pipe of the compressor is connected to the third valve hole of the electric valve.

[0011] Preferably, the electric valve conducts the first valve hole and the fourth valve hole, so that the refrigerant flows along the second pipe opening of the first heat exchanger, the first valve hole of the electric valve, the fourth valve hole and the first pipe opening of the third heat exchanger;

[0012] The electric valve connects the second valve hole and the third valve hole, so that the refrigerant flows along the first pipe opening of the second heat exchanger, the second valve hole and the third valve hole of the electric valve and the second input pipe of the compressor.

[0013] Preferably, the electric valve conducts the first valve hole and the second valve hole, so that the refrigerant flows along the second pipe opening of the first heat exchanger, the first valve hole of the electric valve, the second valve hole and the first pipe opening of the second heat exchanger;

[0014] The electric valve connects the fourth valve hole and the third valve hole, so that the refrigerant flows along the first pipeline opening of the third heat exchanger, the fourth valve hole of the electric valve, the third valve hole and the second input pipeline of the compressor.

[0015] Preferably, the second connecting hole and the third connecting hole of the economizer are connected through a functional pipeline, the functional pipeline is provided with a first throttling device, and the third connecting hole and the fourth connecting hole are connected inside the economizer, so that the refrigerant flows along the second pipeline opening of the second heat exchanger, the first connecting hole of the economizer, the second connecting hole, the first throttling device, the third connecting hole, the fourth connecting hole and the first input pipeline of the compressor.

[0016] Preferably, a high-pressure switch is provided on the first output pipeline of the compressor;

[0017] A separator, a needle valve and a low-pressure switch are arranged in sequence on the second input pipeline of the compressor.

[0018] Preferably, the first heat exchanger is provided with a water inlet and a water outlet, and the water inlet and the water outlet of the first heat exchanger are connected to the water tank of the external water-using equipment through a pipe; the second heat exchanger is provided with a water inlet and a water outlet, and the water inlet and the water outlet of the second heat exchanger are connected to the water tank of the external temperature control equipment through a pipe; a fan is installed on one side of the third heat exchanger.

[0019] Preferably, the second throttling member is arranged on a pipeline connecting the economizer and the third heat exchanger.

[0020] Preferably, the first heat exchanger adopts a high-efficiency tank; the second heat exchanger adopts a plate heat exchanger; and the third heat exchanger adopts a fin heat exchanger.

[0021] Compared with the prior art, the utility model has the following beneficial effects: the utility model provides a heat pump system with heat recovery, comprising an electric valve, an economizer, a throttling device, a compressor, a first heat exchanger, a second heat exchanger and a third heat exchanger, wherein the throttling device comprises a first throttling member and a second throttling member; the compressor has a first output pipeline, a first input pipeline and a second input pipeline; the first heat exchanger is connected to an external water-using device, the first heat exchanger is connected to the first output pipeline of the compressor, and the first heat exchanger is connected to the electric valve through a pipeline; the second heat exchanger is connected to an external temperature control device, the second heat exchanger is connected to the economizer through a pipeline, and the second heat exchanger is connected to the electric valve through a pipeline; the third heat exchanger is connected to the economizer through a pipeline, and the third heat exchanger is connected to the electric valve through a pipeline;

[0022] Wherein, the heat pump system has a cooling mode and a heating mode that can be switched with each other. In the cooling mode, the electric valve can make the refrigerant in the compressor flow along the flow direction of the first heat exchanger, the electric valve, the third heat exchanger, the second throttling device, the economizer, the second heat exchanger, the electric valve and the second input pipeline of the compressor, and finally return to the compressor to form a closed loop; in the heating mode, the economizer is connected to the first input pipeline of the compressor, and the flow direction of the refrigerant in the compressor includes a first flow direction and a second flow direction. The electric valve can make the refrigerant in the compressor flow along the first heat exchanger, the electric valve, the second heat exchanger, the economizer, the first throttling device, the economizer and the first input pipeline of the compressor, and finally return to the compressor to form a closed loop; the electric valve can make the refrigerant in the compressor flow along the second flow direction of the first heat exchanger, the electric valve, the second heat exchanger, the economizer, the second throttling device, the third heat exchanger, the electric valve and the second input pipeline of the compressor, and finally return to the compressor to form a closed loop.

[0023] In traditional cooling and heating systems, a large amount of heat is discharged to the outside during the cooling process, while in the heating process, the heat that exceeds the demand is not fully utilized. The utility model uses heat recovery technology to use the originally wasted heat to heat domestic water, thereby improving the overall energy utilization efficiency. Due to the improved energy utilization efficiency, the utility model can reduce the user's energy costs, reduce long-term operating costs, and provide economic advantages for users. The utility model can supply domestic hot water while providing cooling or heating, providing users with a more comfortable and convenient living experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings, wherein:

[0025] Figure 1This is a schematic diagram of the refrigerant flow structure of a refrigeration mode of a heat pump system with heat recovery in an embodiment of the utility model;

[0026] Figure 2 This is a schematic diagram of the refrigerant flow structure in the heating mode of a heat pump system with heat recovery in an embodiment of the utility model;

[0027] Figure 3 It is a schematic structural diagram of an electric valve of a heat pump system with heat recovery in an embodiment of the utility model;

[0028] Figure 4 It is a structural schematic diagram of an economizer of a heat pump system with heat recovery in an embodiment of the utility model;

[0029] In the figure: 11-first valve hole, 12-second valve hole, 13-third valve hole, 14-fourth valve hole;

[0030] 21 - first connecting hole, 22 - second connecting hole, 23 - third connecting hole, 24 - fourth connecting hole. DETAILED DESCRIPTION

[0031] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0032] The following is a further description of the specific implementation of the present invention in conjunction with the accompanying drawings:

[0033] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the positions or elements referred to must have specific directions, be constructed and operated in specific directions. Therefore, they cannot be understood as limitations on the present invention.

[0034] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0035] For heating and cooling, traditional heat pump systems have long been the mainstream solution. However, with the increase in energy consumption and the improvement of environmental awareness, the limitations of these traditional methods have gradually become apparent. The applicant of the utility model has found in long-term industry practice that although heat pump systems have made certain progress in energy conservation and emission reduction, in actual applications, especially in the cooling and heating processes, a large amount of heat is still not fully utilized, resulting in energy waste and low efficiency.

[0036] Through in-depth research and analysis of existing heat pump systems, the applicant of this patent has found that these systems often ignore the potential for heat recovery in their designs, especially the heat emitted during the cooling process and the excess heat generated during the heating process. If this heat is effectively recovered and utilized, it will greatly improve the energy efficiency of the system and reduce the impact on the environment.

[0037] In order to solve this problem, the applicant of this patent has carried out a series of technical innovations and research. The applicant first re-examined the working principle of the heat pump system, especially the heat flow and temperature changes during the heat exchange process. By accurately controlling the flow of the refrigerant and using a high-efficiency heat exchanger, the applicant designed a new type of heat pump system that can recover heat for heating domestic water while cooling, and can also achieve secondary use of heat during the heating process.

[0038] To this end, the utility model provides a heat pump system with heat recovery, which realizes the maximum heat recovery and utilization without significantly affecting the cooling and heating effects through intelligent control and optimized heat exchange process. This innovation not only improves the overall energy efficiency of the system, but also reduces the energy cost of users and the burden on the environment, solving the problem of heat waste in traditional heat pump systems.

[0039] like Figure 1 to Figure 4 As shown, a heat pump system with heat recovery described in the utility model comprises an electric valve, an economizer, a throttling device, a compressor, a first heat exchanger, a second heat exchanger and a third heat exchanger, wherein the throttling device comprises a first throttling member and a second throttling member; the compressor has a first output pipeline, a first input pipeline and a second input pipeline; the first heat exchanger is connected to an external water-using device, the first heat exchanger is connected to the first output pipeline of the compressor, and the first heat exchanger is connected to the electric valve through a pipeline; the second heat exchanger is connected to an external temperature control device, the second heat exchanger is connected to the economizer through a pipeline, and the second heat exchanger is connected to the electric valve through a pipeline; the third heat exchanger is connected to the economizer through a pipeline, and the third heat exchanger is connected to the electric valve through a pipeline;

[0040] Wherein, the heat pump system has a cooling mode and a heating mode that can be switched with each other. In the cooling mode, the electric valve can make the refrigerant in the compressor flow along the flow direction of the first heat exchanger, the electric valve, the third heat exchanger, the second throttling device, the economizer, the second heat exchanger, the electric valve and the second input pipeline of the compressor, and finally return to the compressor to form a closed loop; in the heating mode, the economizer is connected to the first input pipeline of the compressor, and the flow direction of the refrigerant in the compressor includes a first flow direction and a second flow direction. The electric valve can make the refrigerant in the compressor flow along the first heat exchanger, the electric valve, the second heat exchanger, the economizer, the first throttling device, the economizer and the first input pipeline of the compressor, and finally return to the compressor to form a closed loop; the electric valve can make the refrigerant in the compressor flow along the second flow direction of the first heat exchanger, the electric valve, the second heat exchanger, the economizer, the second throttling device, the third heat exchanger, the electric valve and the second input pipeline of the compressor, and finally return to the compressor to form a closed loop.

[0041] More specifically, the electric valve is an electric four-way valve; as a key control component of the system, the electric valve is responsible for regulating the flow direction of the refrigerant. According to the needs of cooling or heating, the electric valve can open a specific valve hole to guide the refrigerant to flow along a preset path.

[0042] It should be noted that in the heat pump system, the throttling device is an indispensable component, which is responsible for regulating the flow rate of the refrigerant and establishing the high and low pressure difference of the system, thereby controlling the operation of the entire system. Common throttling devices include but are not limited to electronic expansion valves, thermal expansion valves and capillaries. The throttling device used in this application is an electronic expansion valve. In some special embodiments, other throttling devices can also be used according to system requirements. More importantly, the second throttling device in this application is the main electronic expansion valve, and the first throttling device is the auxiliary electronic expansion valve. The main electronic expansion valve is responsible for the main flow control of the system, while the auxiliary electronic expansion valve is used to adjust the flow of the auxiliary branch. This distribution helps to accurately adjust the distribution of the refrigerant according to different heat loads and operating conditions, and improve the energy efficiency of the system. Through the coordinated work of the main and auxiliary electronic expansion valves, the system can be optimized in different working modes. In the heating mode of this system, the second flow direction is the main circuit flow direction, and the first flow direction is the branch flow direction. The main circuit is usually responsible for handling larger heat loads, while the branch handles smaller loads or auxiliary functions. Through this allocation, the system can adjust the direction and size of energy according to actual needs to ensure that energy is used effectively.

[0043] The compressor is the core of the heat pump system. It is responsible for compressing the refrigerant and increasing its temperature and pressure. The compressor has three pipes. The first output pipe is used to discharge the compressed refrigerant. The first input pipe and the second input pipe are used to recover the refrigerant after cooling or heating to prepare for the next compression cycle.

[0044] More specifically, an economizer is an auxiliary heat exchanger used in a heat pump system. Its main function is to improve the thermal efficiency and performance of the system and increase the energy efficiency ratio (COP) of the system.

[0045] It should be noted that Figure 1 The arrow direction in the figure indicates the direction of refrigerant flow in cooling mode. Figure 2 The direction of the arrow in the figure indicates the direction of refrigerant flow in heating mode.

[0046] In cooling mode, the refrigerant is in a high-temperature and high-pressure gas state when it comes out of the compressor. The refrigerant in this state is overheated, that is, it has absorbed a lot of heat, and its temperature is higher than its boiling point due to the increase in pressure. After the high-temperature and high-pressure refrigerant comes out of the first output pipe of the compressor, it first enters the first heat exchanger. Since the first heat exchanger is connected to the external domestic water equipment, the refrigerant exchanges heat with the external domestic water tank in the first heat exchanger. Since the refrigerant is a high-temperature and high-pressure gas coming out of the compressor, it releases heat to the domestic water, causing the temperature of the domestic water to rise. After the heat exchange, the temperature of the refrigerant decreases, but it is still in a high-pressure state. The electric valve controls the flow direction of the refrigerant to ensure that the refrigerant flows along the predetermined path. In cooling mode, the electric valve conducts the channel between the first heat exchanger and the third heat exchanger. After passing through the electric valve, the refrigerant flows to the third heat exchanger. Here, the refrigerant further dissipates heat with the assistance of the fan, and the temperature is further reduced. Then, the refrigerant passes through the main electronic expansion valve, and the pressure of the refrigerant decreases, changing from a high-pressure state to a low-pressure state. At this time, the refrigerant passing through the main electronic expansion valve enters the economizer for precooling, preparing for the heat exchange that is about to enter the second heat exchanger. The refrigerant precooled by the economizer enters the second heat exchanger. Since the second heat exchanger is connected to the external temperature control device, the refrigerant exchanges heat with the water in the water tank of the external temperature control device. The refrigerant absorbs the heat in the water tank, causing the water temperature to drop, thereby achieving a cooling effect. At the same time, the temperature of the refrigerant rises slightly due to the absorption of heat. After passing through the second heat exchanger, the refrigerant passes through the electric valve again, returns to the second input pipe of the compressor, and enters the compressor, completing a cycle.

[0047] More specifically, the state change of the refrigerant during the refrigeration process is that the refrigerant coming out of the compressor is a high-temperature and high-pressure gas. In the first heat exchanger, the refrigerant releases heat and the temperature drops. After passing through the electric valve and the third heat exchanger, the refrigerant further dissipates heat. In the economizer, the refrigerant is precooled and the temperature drops further. In the second heat exchanger, the refrigerant absorbs heat and the temperature rises slightly, but the overall state remains low temperature and low pressure. Finally, the refrigerant returns to the compressor, ready to start a new round of circulation.

[0048] Among them, in the cooling mode, the role of the economizer is to pre-cool the gaseous refrigerant and reduce its temperature, so as to prepare for the heat exchange process that is about to enter the second heat exchanger. This process helps to improve the efficiency of the entire heat pump system. Specifically, the role of the economizer includes pre-cooling the gaseous refrigerant and optimizing the circulation process. The use of the economizer helps to optimize the circulation process of the entire heat pump system. By pre-cooling the refrigerant in the economizer, the system can more effectively manage and adjust the temperature and pressure of the refrigerant to ensure efficient operation under different working conditions.

[0049] In the heating mode, after the high-temperature and high-pressure refrigerant comes out of the first output pipe of the compressor, it first enters the first heat exchanger. Since the first heat exchanger is connected to the external domestic water equipment, the refrigerant exchanges heat with the external domestic water tank in the first heat exchanger, and the refrigerant releases part of the heat to heat the domestic water. Then, the refrigerant coming out of the first heat exchanger enters the second heat exchanger through the electric valve. It should be noted that in the heating mode, the electric valve conducts the connection between the first heat exchanger and the second heat exchanger. Since the second heat exchanger is connected to the external temperature control device, the refrigerant exchanges heat with the water in the water tank of the external temperature control device. The refrigerant then releases the heat in the water tank, causing the water temperature to rise, thereby achieving a heating effect. Although the refrigerant at this time has provided part of the heat to the domestic water, its temperature is still much higher than the temperature required for heating, so it is sufficient to achieve a heating effect.

[0050] Then, the refrigerant that has been heat exchanged in the second heat exchanger flows to the economizer. The refrigerant that has come out of the economizer is divided into two paths, namely the first flow and the second flow. The first flow, that is, the refrigerant that has come out of the economizer passes through the secondary electronic expansion valve and then enters the economizer again to exchange heat with the refrigerant that has just entered the economizer from the second heat exchanger. At this time, the refrigerant in the first flow absorbs heat, and the temperature and enthalpy of the refrigerant increase accordingly, which helps to improve the efficiency of the compressor because the compressor can compress more heat with less energy. The refrigerant that has completed the heat exchange then flows from the first input pipe of the compressor to the compressor.

[0051] The second flow direction is that the refrigerant after coming out of the economizer flows to the main electronic expansion valve. At this time, the refrigerant exchanges heat with the refrigerant entering the economizer for the second time, and the temperature drops again. Although the enthalpy value decreases, this design makes it at a lower temperature when entering the third heat exchanger, preventing the refrigerant temperature from being too high to absorb the heat in the air. Then it flows to the third heat exchanger. In the third heat exchanger, the refrigerant can absorb the heat from the external environment more effectively. When it enters the compressor, it will also require less compression work to reach the required pressure and temperature. This can reduce the load of the compressor and improve energy utilization. The refrigerant coming out of the third heat exchanger flows to the second input pipe of the compressor through the electric valve and enters the compressor to complete a cycle.

[0052] Among them, in the heating mode, the economizer preheats the refrigerant that is about to enter the compressor through an internal heat exchange process, thereby reducing the work that the compressor needs to do and improving the system's energy efficiency ratio (COP).

[0053] like Figure 3 , Figure 4 As shown, in a specific implementation, the electric valve is provided with a first valve hole, a second valve hole, a third valve hole and a fourth valve hole; the economizer is provided with a first connecting hole, a second connecting hole, a third connecting hole and a fourth connecting hole; the first heat exchanger, the second heat exchanger and the third heat exchanger are all provided with a first pipe port and a second pipe port; the first pipe port of the first heat exchanger is connected to the first output pipe of the compressor, and the second pipe port of the first heat exchanger is connected to the first valve hole of the electric valve through a pipe; the first pipe port of the second heat exchanger is connected to the second valve hole of the electric valve through a pipe, and the second pipe port of the second heat exchanger is connected to the first connecting hole of the economizer through a pipe; the first pipe port of the third heat exchanger is connected to the fourth valve hole of the electric valve through a pipe, and the second pipe port of the third heat exchanger is connected to the second connecting hole of the economizer through a pipe; the second input pipe of the compressor is connected to the third valve hole of the electric valve.

[0054] The electric valve controls the flow direction of the refrigerant through its four valve holes. The electric valve will adjust the opening and closing state according to the system requirements, open or close specific valve holes, thereby changing the flow path of the refrigerant to achieve cooling or heating functions.

[0055] As an internal heat exchanger, the economizer precools or preheats the refrigerant in the system, thereby improving the efficiency of the compressor and the heating performance of the entire system.

[0056] The first heat exchanger, the second heat exchanger and the third heat exchanger are connected to the electric valve and the economizer through the first and second pipeline ports, respectively. This connection method allows the refrigerant to flow between different heat exchangers to achieve effective heat transfer.

[0057] The system can switch between cooling and heating modes efficiently by precisely controlling the refrigerant flow through electric valves. In heating mode, the preheating effect of the economizer reduces the energy consumption of the compressor and improves the energy efficiency ratio of the system. Since the system optimizes the refrigerant flow and heat exchange process, energy consumption is reduced, thereby reducing operating costs. This means lower energy costs and longer system maintenance cycles for users.

[0058] In a specific implementation, in the cooling mode, the electric valve conducts the first valve hole and the fourth valve hole, so that the refrigerant flows along the second pipe port of the first heat exchanger, the first valve hole of the electric valve, the fourth valve hole and the first pipe port of the third heat exchanger;

[0059] The electric valve conducts the second valve hole and the third valve hole, allowing the refrigerant to flow along the first pipe port of the second heat exchanger, the second valve hole of the electric valve, the third valve hole and the second input pipe of the compressor, which usually corresponds to the cooling mode of the system. The refrigerant absorbs and releases heat in this process. Correct conduction of the electric valve can ensure that the refrigerant flows along the designed path, avoiding energy loss and reduced system efficiency. An effective refrigerant flow path can maximize the use of heat, reduce energy waste and reduce operating costs.

[0060] In a specific implementation, in the heating mode, the electric valve conducts the first valve hole and the second valve hole, so that the refrigerant flows along the second pipe port of the first heat exchanger, the first valve hole of the electric valve, the second valve hole and the first pipe port of the second heat exchanger;

[0061] The electric valve conducts the fourth valve hole and the third valve hole, so that the refrigerant flows along the first pipeline opening of the third heat exchanger, the fourth valve hole of the electric valve, the third valve hole and the second input pipeline of the compressor.

[0062] In heating mode, the system can achieve effective heating effect by connecting the first valve hole and the second valve hole. When the refrigerant comes out of the compressor, it is a high-temperature and high-pressure gas. In the first heat exchanger, it exchanges heat with the external domestic water equipment and releases some heat. Then it passes through the electric valve and flows to the second heat exchanger, where it exchanges heat with the water in the external temperature control equipment, absorbs heat, and increases the water temperature. This process achieves the heating effect of the space.

[0063] In a specific implementation, in the heating mode, the second connecting hole and the third connecting hole of the economizer are connected through a functional pipe, a first throttling device is provided on the functional pipe, and the third connecting hole and the fourth connecting hole are connected inside the economizer, so that the refrigerant flows along the second pipe opening of the second heat exchanger, the first connecting hole of the economizer, the second connecting hole, the first throttling device, the third connecting hole, the fourth connecting hole and the first input pipe of the compressor.

[0064] The functional pipeline connects the second connection hole and the third connection hole of the economizer so that the refrigerant can flow between the two connection holes. An electronic expansion valve is provided on this pipeline, which is responsible for controlling the flow and pressure of the refrigerant, thereby affecting the heat exchange efficiency and overall performance of the system.

[0065] The third and fourth connection holes are connected inside the economizer, which allows the refrigerant to exchange heat inside the economizer. In this process, the temperature and pressure of the refrigerant will change. Through the coordinated work of the electronic expansion valve and the economizer, the system can more effectively control the flow and pressure of the refrigerant in the heating mode, thereby improving the heat exchange efficiency and the energy efficiency ratio of the system.

[0066] In a specific implementation, a high-pressure switch is provided on the first output pipeline of the compressor; a separator, a needle valve and a low-pressure switch are provided in sequence on the second input pipeline of the compressor.

[0067] The high-pressure switch installed on the first output pipe of the compressor is a safety device used to monitor the pressure of the refrigerant. When the pressure in the system exceeds the preset safety threshold, the high-pressure switch will be triggered to automatically shut down the system or adjust the working state of the compressor to prevent damage caused by overpressure in the system.

[0068] The separator located on the second input pipe of the compressor is mainly used to store part of the refrigerant in the system to prevent compressor liquid hammer and excessive refrigerant from diluting the compressor oil, ensuring the safe and normal operation of the compressor. The separator can also send enough refrigerant and oil back to the compressor to maintain the operating efficiency of the system and the oil level in the crankcase. The needle valve is used to evacuate or charge the refrigerant during manufacturing, and the user uses the needle valve to release the refrigerant during maintenance.

[0069] The low-pressure switch installed on the second input pipe of the compressor is used to monitor the pressure of the refrigerant. When the pressure in the system is lower than a certain safety threshold, the low-pressure switch will be triggered to automatically shut down the system or adjust the working state of the compressor to prevent damage caused by low-pressure operation of the system.

[0070] In a specific implementation, the first heat exchanger is provided with a water inlet and a water outlet, and the water inlet and the water outlet of the first heat exchanger are connected to the water tank of the external water-using equipment through a pipe; when the refrigerant flows in the first heat exchanger, it releases heat, thereby heating the water in the water tank flowing through the heat exchanger. The second heat exchanger is provided with a water inlet and a water outlet, and the water inlet and the water outlet of the second heat exchanger are connected to the water tank of the external temperature control equipment through a pipe; it is used to heat or cool the water in the water tank of the temperature control equipment, thereby achieving the effect of cooling or heating. A fan is installed on one side of the third heat exchanger to accelerate air flow and improve heat exchange efficiency. In cooling mode, the refrigerant absorbs external heat and evaporates in the third heat exchanger; in heating mode, the refrigerant releases heat and condenses in the third heat exchanger.

[0071] Through the configuration of these three heat exchangers, the heat pump system can provide domestic hot water and space temperature control at the same time, realizing multiple uses of one machine. The system can use waste heat for space heating or cooling while providing domestic hot water, improving energy utilization efficiency.

[0072] In a specific implementation, the second throttling member is disposed on a pipeline connecting the economizer and the third heat exchanger.

[0073] The second throttling device is the main electronic expansion valve, which is a key component in the heat pump system. It is responsible for accurately controlling the flow and pressure of the refrigerant. By adjusting the opening of the valve port, the electronic expansion valve can control the rate at which the refrigerant flows from the high-pressure area to the low-pressure area, thereby affecting the heat exchange efficiency and temperature control of the system.

[0074] In a specific implementation, the first heat exchanger uses a high-efficiency tank; the second heat exchanger uses a plate heat exchanger; and the third heat exchanger uses a finned heat exchanger. The high-efficiency tank is usually used to heat domestic water. Its design allows efficient heat exchange between the refrigerant and water, with water flowing in the tube side and the refrigerant flowing in the shell side, thereby heating the water quickly and efficiently. The plate heat exchanger is used for temperature control of the space. It consists of a series of thin metal plates. The refrigerant and water (or air) flow between adjacent plates and exchange heat through the plate walls. This design provides a large heat exchange area, thereby improving the heat exchange efficiency. The finned heat exchanger is a key component in the heat pump system, which allows the refrigerant to easily exchange heat with the outside air.

[0075] By using different types of heat exchangers, the system can be optimized for different heat exchange requirements and improve overall energy efficiency. The combination of high-efficiency tanks, plate heat exchangers and finned heat exchangers enables the heat pump system to provide domestic hot water, space heating or cooling at the same time, achieving multiple uses of one machine.

[0076] The working principle of a heat pump system with heat recovery described in the utility model is as follows: the utility model provides a heat pump system with heat recovery, including an electric valve, an economizer, a throttling device, a compressor, a first heat exchanger, a second heat exchanger and a third heat exchanger, the throttling device including a first throttling member and a second throttling member; the compressor has a first output pipeline, a first input pipeline and a second input pipeline; the first heat exchanger is connected to an external water-using device, the first heat exchanger is connected to the first output pipeline of the compressor, and the first heat exchanger is connected to the electric valve through a pipeline; the second heat exchanger is connected to an external temperature control device, the second heat exchanger is connected to the economizer through a pipeline, and the second heat exchanger is connected to the electric valve through a pipeline; the third heat exchanger is connected to the economizer through a pipeline, and the third heat exchanger is connected to the electric valve through a pipeline;

[0077] Wherein, the heat pump system has a cooling mode and a heating mode that can be switched with each other. In the cooling mode, the electric valve can make the refrigerant in the compressor flow along the flow direction of the first heat exchanger, the electric valve, the third heat exchanger, the second throttling device, the economizer, the second heat exchanger, the electric valve and the second input pipeline of the compressor, and finally return to the compressor to form a closed loop; in the heating mode, the economizer is connected to the first input pipeline of the compressor, and the flow direction of the refrigerant in the compressor includes a first flow direction and a second flow direction. The electric valve can make the refrigerant in the compressor flow along the first heat exchanger, the electric valve, the second heat exchanger, the economizer, the first throttling device, the economizer and the first input pipeline of the compressor, and finally return to the compressor to form a closed loop; the electric valve can make the refrigerant in the compressor flow along the second flow direction of the first heat exchanger, the electric valve, the second heat exchanger, the economizer, the second throttling device, the third heat exchanger, the electric valve and the second input pipeline of the compressor, and finally return to the compressor to form a closed loop.

[0078] The heat pump system is designed with cooling mode and heating mode. The system realizes the circulation of refrigerant in the closed-loop system through the coordinated work of the compressor, heat exchanger and electric valve. The switching between modes is realized by the control of the electric valve. The opening and closing state of the electric valve determines the flow direction of the refrigerant, thereby realizing different functions. In the cooling mode, the refrigerant exchanges heat with the external water-using equipment and uses the excess heat to heat domestic water. And through the heat exchange of the external temperature control equipment, the external heat is absorbed to achieve the cooling effect. At the same time, the pre-cooling effect of the economizer helps to improve the energy efficiency of the system. In the heating mode, the refrigerant realizes the heating function while heating domestic water. At the same time, the system improves the overall energy efficiency and realizes the efficient use of energy through the heat recovery function of the economizer. It solves the technical problem that in the traditional cooling and heating system, a large amount of heat is discharged to the outside during the cooling process, while the heat exceeding the demand is not fully utilized during the heating process.

[0079] For other structures of the heat pump system with heat recovery described in this embodiment, refer to the prior art.

[0080] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Therefore, any modification, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A heat pump system with heat recovery, characterized in that: include: Electric valve; Economizer; A throttling device, the throttling device comprising a first throttling member and a second throttling member; a compressor having a first output conduit, a first input conduit, and a second input conduit; A first heat exchanger, wherein the first heat exchanger is connected to an external water-using device, the first heat exchanger is connected to a first output pipeline of the compressor, and the first heat exchanger is connected to the electric valve through a pipeline; a second heat exchanger, wherein the second heat exchanger is connected to an external temperature control device, the second heat exchanger is connected to the economizer through a pipeline, and the second heat exchanger is connected to the electric valve through a pipeline; a third heat exchanger, wherein the third heat exchanger is connected to the economizer through a pipeline, and the third heat exchanger is connected to the electric valve through a pipeline; The heat pump system has a refrigeration mode and a heating mode that can be switched between each other. In the refrigeration mode, the electric valve can make the refrigerant in the compressor flow along the first heat exchanger, the electric valve, the third heat exchanger, the second throttling device, the economizer, the second heat exchanger, the electric valve and the second input pipeline of the compressor, and finally return to the compressor to form a closed loop; In the heating mode, the economizer is connected to the first input pipeline of the compressor, and the flow direction of the refrigerant in the compressor includes a first flow direction and a second flow direction. The electric valve can make the refrigerant in the compressor flow along the first heat exchanger, the electric valve, the second heat exchanger, the economizer, the first throttling device, the economizer and the first input pipeline of the compressor, and finally return to the compressor to form a closed loop; the electric valve can make the refrigerant in the compressor flow along the second flow direction of the first heat exchanger, the electric valve, the second heat exchanger, the economizer, the second throttling device, the third heat exchanger, the electric valve and the second input pipeline of the compressor, and finally return to the compressor to form a closed loop.

2. A heat pump system with heat recovery according to claim 1, characterized in that: include: The electric valve is provided with a first valve hole, a second valve hole, a third valve hole and a fourth valve hole; The economizer is provided with a first connection hole, a second connection hole, a third connection hole and a fourth connection hole; The first heat exchanger, the second heat exchanger and the third heat exchanger are each provided with a first pipe opening and a second pipe opening; The first pipeline port of the first heat exchanger is connected to the first output pipeline of the compressor, and the second pipeline port of the first heat exchanger is connected to the first valve hole of the electric valve through a pipeline; The first pipeline port of the second heat exchanger is connected to the second valve hole of the electric valve through a pipeline, and the second pipeline port of the second heat exchanger is connected to the first connecting hole of the economizer through a pipeline; The first pipe port of the third heat exchanger is connected to the fourth valve hole of the electric valve through a pipe, and the second pipe port of the third heat exchanger is connected to the second connecting hole of the economizer through a pipe; The second input pipeline of the compressor is connected to the third valve hole of the electric valve.

3. A heat pump system with heat recovery according to claim 2, characterized in that: In cooling mode, it includes: The electric valve conducts the first valve hole and the fourth valve hole, so that the refrigerant flows along the second pipe port of the first heat exchanger, the first valve hole of the electric valve, the fourth valve hole and the first pipe port of the third heat exchanger; The electric valve connects the second valve hole and the third valve hole, so that the refrigerant flows along the first pipe opening of the second heat exchanger, the second valve hole and the third valve hole of the electric valve and the second input pipe of the compressor.

4. A heat pump system with heat recovery according to claim 2, characterized in that: In heating mode, it includes: The electric valve connects the first valve hole and the second valve hole, so that the refrigerant flows along the second pipe opening of the first heat exchanger, the first valve hole of the electric valve, the second valve hole and the first pipe opening of the second heat exchanger; The electric valve connects the fourth valve hole and the third valve hole, so that the refrigerant flows along the first pipeline opening of the third heat exchanger, the fourth valve hole of the electric valve, the third valve hole and the second input pipeline of the compressor.

5. A heat pump system with heat recovery according to claim 2, characterized in that: In heating mode, it includes: The second connecting hole and the third connecting hole of the economizer are connected through a functional pipeline, and a first throttling device is provided on the functional pipeline. The third connecting hole and the fourth connecting hole are connected inside the economizer, so that the refrigerant flows along the second pipeline opening of the second heat exchanger, the first connecting hole of the economizer, the second connecting hole, the first throttling device, the third connecting hole, the fourth connecting hole and the first input pipeline of the compressor.

6. A heat pump system with heat recovery according to claim 1, characterized in that: include: A high-pressure switch is provided on the first output pipeline of the compressor; A separator, a needle valve and a low-pressure switch are arranged in sequence on the second input pipeline of the compressor.

7. A heat pump system with heat recovery according to claim 1, characterized in that: include: The first heat exchanger is provided with a water inlet and a water outlet, and the water inlet and the water outlet of the first heat exchanger are connected to a water tank of an external water-using device through a pipeline; The second heat exchanger is provided with a water inlet and a water outlet, and the water inlet and the water outlet of the second heat exchanger are connected to the water tank of the external temperature control device through a pipeline; A fan is installed on one side of the third heat exchanger.

8. The heat pump system with heat recovery according to claim 1, characterized in that: include: The second throttling element is arranged on a pipeline connecting the economizer and the third heat exchanger.

9. The heat pump system with heat recovery according to claim 1, characterized in that: include: The first heat exchanger uses a high-efficiency tank; The second heat exchanger is a plate heat exchanger; The third heat exchanger is a finned heat exchanger.

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