Heat pump system

Abstract

The utility model relates to the technical field of heat supply systems, and discloses a heat pump system. The heat pump system comprises a first heat exchange module and a second heat exchange module, the multi-channel heat exchanger comprises a first channel, a second channel and a third channel, and the first channel communicates with the first compressor to form a first circulation loop; the second heat exchange module comprises a second compressor and a first heat exchanger, and the second compressor, a first flow path of the first heat exchanger and a third channel communicate in sequence to form a second circulation loop; the third heat exchange module comprises a buffer water tank, and a first circulation opening of the buffer water tank, a second flow path of the first heat exchanger and a second circulation opening of the buffer water tank communicate in sequence to form a first heat supply loop; and the heat storage water tank communicates with the buffer water tank to form a second heat supply loop, and the heat storage water tank communicates with the second channel to form a heat storage loop. The stability of the heat supply temperature can be improved, and the user comfort is higher.

Description

Technical Field

[0001] This application relates to the field of heating system technology, such as a heat pump system. Background Technology

[0002] Cascade heat pump systems achieve high efficiency under large temperature differences by combining two or more compressor refrigeration cycles. Their working principle includes a high-temperature cycle and a low-temperature cycle, with heat transfer between the two cycles through an intermediate heat exchanger. Cascade heat pump systems can effectively reduce the compression ratio of a single compressor, lower the exhaust temperature, and improve the system's heating capacity in low-temperature environments, thus making them widely used in the heat pump heating field.

[0003] For example, a high-temperature, high-efficiency two-stage heat pump system is proposed in related technologies, including: a primary heat pump, a secondary heat pump, and a buffer water tank energy storage and release system; the primary heat pump includes a primary compressor, a first channel of a multi-channel heat exchanger, and a primary evaporator, forming a first circulation loop; the buffer water tank energy storage and release system includes a buffer water tank, an internal circulation pump, and a second channel of a multi-channel heat exchanger, forming a second circulation loop; the secondary heat pump includes a secondary condenser, a third channel of a multi-channel heat exchanger, and a secondary condenser, forming a third circulation loop; the secondary condenser is connected to an energy supply outlet pipe and an energy supply return pipe, forming a fourth circulation loop; the buffer water tank is sequentially connected to a second one-way valve and an energy supply outlet pipe, and an eighth pipe is sequentially connected to a second valve, a second channel of a multi-channel heat exchanger, and the inlet of the buffer water tank, forming a fifth circulation loop.

[0004] In related technologies, although a buffer water tank energy storage and release system is used to store or release heat when the heating capacity of the primary heat pump does not match the heat required by the secondary heat pump, so as to ensure that the secondary heat pump obtains sufficient heat to operate normally, this type of heat pump often stops heating after reaching the user's desired temperature, and then resumes heating when the temperature drops, which reduces the user's comfort.

[0005] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this application, and therefore may include information that does not constitute prior art known to those skilled in the art. Utility Model Content

[0006] To provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended as a general commentary, nor is it intended to identify key / important components or describe the scope of protection of these embodiments, but rather as a prelude to the detailed description that follows.

[0007] This disclosure provides a heat pump system that can improve the stability of heating temperature and enhance user comfort.

[0008] In some embodiments, a heat pump system is provided, comprising: a first heat exchange module including a first compressor; a multi-channel heat exchanger including a first channel, a second channel, and a third channel, wherein the first channel and the first compressor are connected to form a first circulation loop; a second heat exchange module including a second compressor and the first heat exchanger, wherein the second compressor, the first flow path of the first heat exchanger, and the third channel are sequentially connected to form a second circulation loop; a third heat exchange module including a buffer tank, wherein the first circulation port of the buffer tank, the second flow path of the first heat exchanger, and the second circulation port of the buffer tank are sequentially connected to form a first heating loop; and a hot water storage tank, wherein the hot water storage tank and the buffer tank are connected to form a second heating loop, and the hot water storage tank and the second channel are connected to form a heat storage loop.

[0009] Optionally, the first circulation port, the second channel, and the second circulation port of the buffer water tank are connected in sequence to form a third heating circuit.

[0010] Optionally, the first heat exchange module further includes: a four-way reversing valve, including a first reversing port, a second reversing port, a third reversing port, and a fourth reversing port, wherein the first reversing port is connected to a first channel; a first throttle valve, connected to the end of the first channel away from the first reversing port; a second heat exchanger, wherein the two ends of the second heat exchanger are respectively connected to the end of the first throttle valve away from the first channel and the third reversing port; a gas-liquid separator, wherein the inlet of the gas-liquid separator is connected to the fourth reversing port, and the outlet of the gas-liquid separator is connected to the inlet of the first compressor; and the outlet of the first compressor is connected to the second reversing port.

[0011] Optionally, the second heat exchange module further includes a second throttling valve located on the pipeline between the first flow path and the third channel of the first heat exchanger.

[0012] Optionally, the third heat exchange module further includes: a first pump body located on a pipeline between the first circulation port of the buffer water tank and the second flow path of the first heat exchanger, and / or on a pipeline between the second flow path of the first heat exchanger and the second circulation port of the buffer water tank.

[0013] Optionally, the heat pump system further includes a heating module, including a third heat exchanger, the two ends of which are connected to the third circulation port and the fourth circulation port of the buffer water tank, respectively.

[0014] Optionally, the heating module further includes: a second pump body located on the pipeline between the third circulation port of the buffer tank and the third heat exchanger, and / or on the pipeline between the third heat exchanger and the fourth circulation port of the buffer tank.

[0015] Optionally, the heat pump system further includes: a first switch module, one end of which is connected to the second channel, and the other end of which is connected to the hot water storage tank and the buffer tank respectively; and / or, a second switch module, one end of which is connected to the second channel and the buffer tank respectively, and the other end of which is connected to the hot water storage tank.

[0016] Optionally, the first switch module includes a first shut-off valve, one end of which is connected to the second channel, and the other end of which is connected to the hot water storage tank and the buffer tank respectively.

[0017] Optionally, the first switch module includes a first shut-off valve and a third pump body. One end of the first shut-off valve is connected to the second channel, and the other end of the first shut-off valve is connected to the hot water storage tank and the buffer tank respectively. The third pump body is connected in parallel with the first shut-off valve.

[0018] Optionally, the heat pump system includes a first switching module; the heat pump system also includes a second shut-off valve located on the pipeline between the buffer tank and the first switching module.

[0019] The heat pump system provided in this disclosure can achieve the following technical effects:

[0020] The heat pump system provided in this embodiment enhances its heat storage capacity and energy efficiency by adding a buffer tank in addition to a hot water storage tank. Furthermore, the buffer tank and the second flow path of the first heat exchanger are connected to form a first heating loop, enabling heat supply to the user end. As an intermediate heat storage unit, the buffer tank provides heating to the user end, buffering fluctuations in heating load and improving the stability of the heating temperature, thus enhancing user comfort.

[0021] The above general description and the description below are exemplary and illustrative only and are not intended to limit this application. Attached Figure Description

[0022] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations and drawings do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are shown as similar elements. The drawings are not to be scaled. And wherein:

[0023] Figure 1 This is a schematic diagram of the structure of a heat pump system provided in one embodiment of this disclosure;

[0024] Figure 2 This is a schematic diagram of a heat pump system operating in a first or fourth mode according to an embodiment of this disclosure;

[0025] Figure 3This is a schematic diagram of a second operating mode of a heat pump system provided in one embodiment of this disclosure;

[0026] Figure 4 This is a schematic diagram of a third operating mode of a heat pump system provided in one embodiment of this disclosure;

[0027] Figure 5 This is a schematic diagram of the fifth operating mode of a heat pump system provided in one embodiment of this disclosure.

[0028] Figure label:

[0029] 1. Heat pump system;

[0030] 10 First heat exchange module; 100 First compressor; 110 Four-way reversing valve; 120 First throttle valve; 130 Second heat exchanger; 140 Gas-liquid separator;

[0031] 20+ channel heat exchanger; 200 first channel; 210 second channel; 220 third channel;

[0032] 30 Second heat exchange module; 300 Second compressor; 310 First heat exchanger; 312 First flow path; 314 Second flow path; 320 Second throttle valve;

[0033] 40 Third heat exchange module; 410 Buffer water tank; 420 First pump body;

[0034] 50 hot water storage tank;

[0035] 60 First switch module; 610 First shut-off valve; 620 Third pump body;

[0036] 70 Second shut-off valve;

[0037] 80 Second switch module; 810 Third shut-off valve; 820 Fourth pump body;

[0038] 90 Heating module; 910 Third heat exchanger; 920 Second pump body. Detailed Implementation

[0039] To provide a more detailed understanding of the features and technical content of the embodiments of this disclosure, the implementation of the embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for illustrative purposes only and are not intended to limit the embodiments of this disclosure. In the following technical description, for ease of explanation, several details are used to provide a full understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be simplified in their depiction to simplify the drawings.

[0040] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this disclosure described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0041] In this disclosure, the terms "upper," "lower," "inner," "middle," "outer," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for better description of the embodiments of this disclosure and their implementations, and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to require them to be constructed and operated in a specific orientation. Furthermore, some of the aforementioned terms may be used to indicate other meanings besides orientation or positional relationship; for example, the term "upper" may in some cases indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in the embodiments of this disclosure according to the specific circumstances.

[0042] Furthermore, the terms "set up," "connect," and "fix" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this disclosure according to the specific circumstances.

[0043] Unless otherwise stated, the term "multiple" means two or more.

[0044] In this embodiment of the disclosure, the character " / " indicates that the objects before and after it are in an "or" relationship. For example, A / B means: A or B.

[0045] The term "and / or" describes an association between objects, indicating that there can be three relationships. For example, A and / or B means that there are three relationships: A, B, and A and B.

[0046] It should be noted that, unless otherwise specified, the embodiments and features described in the present disclosure can be combined with each other.

[0047] In some embodiments, combined with Figure 1As shown, a heat pump system 1 is provided, including a first heat exchange module 10, a multi-channel heat exchanger 20, a second heat exchange module 30, a third heat exchange module 40, and a hot water storage tank 50. The first heat exchange module 10 includes a first compressor 100. The multi-channel heat exchanger 20 includes a first channel 200, a second channel 210, and a third channel 220, with the first channel 200 connected to the first compressor 100 to form a first circulation loop. The second heat exchange module 30 includes a second compressor 300 and a first heat exchanger 310, with the second compressor 300, the first heat exchanger 310's first flow path 312, and the third channel 220 sequentially connected to form a second circulation loop. The third heat exchange module 40 includes a buffer tank 410, with the buffer tank 410's first circulation port (not shown), the first heat exchanger 310's second flow path 314, and the buffer tank 410's second circulation port (not shown) sequentially connected to form a first heating loop. The hot water storage tank 50 and the buffer water tank 410 are connected to form a second heating circuit, and the hot water storage tank 50 and the second channel 210 are connected to form a heat storage circuit.

[0048] In the heat pump system 1 provided in this embodiment, a multi-channel heat exchanger 20 serves as the core hub for heat exchange between multiple modules. The first compressor 100 and the first channel 200 are connected to form a first circulation loop for refrigerant circulation, absorbing or releasing basic heat. The second compressor 300, the first flow path 312 of the first heat exchanger 310, and the third channel 220 are sequentially connected to form a second circulation loop for refrigerant circulation. The second heat exchange module 30, based on the primary heat exchange achieved through the first channel 200 and the third channel 220, performs a secondary heat exchange using the first flow path 312 of the first heat exchanger 310, transferring heat from the first heat exchange module 10 to the third heat exchange module 40. The inclusion of the second compressor 300 forms a cascade heat pump system 1 for heat replenishment to meet higher temperature requirements. The buffer water tank 410 in the third heat exchange module 40 is connected to the second flow path 314 of the first heat exchanger 310, forming a first heating loop for supplying heat to the user. By setting a buffer water tank 410 as an intermediate heat storage unit in the first heating circuit, heat fluctuations are balanced, enabling users to obtain a stable output temperature and improving the user experience of the heat pump system 1. The hot water storage tank 50 and the second channel 210 are connected to form a heat storage circuit, so as to directly utilize the waste heat of the first circulation circuit for heat storage, thereby improving the energy utilization rate of the system. At the same time, the connection between the hot water storage tank 50 and the buffer water tank 410 forms a second heating circuit, realizing the transfer of heat from the hot water storage tank 50 to the buffer water tank 410, further improving the heating temperature stability of the buffer water tank 410.

[0049] Compared with related technologies, the embodiments of this disclosure, by setting up a hot water storage tank 50 for heat storage and adding a buffer water tank 410, further enhance the heat storage capacity of the heat pump system 1 and improve the energy utilization rate of the heat pump system 1. Furthermore, the buffer water tank 410 and the second flow path 314 of the first heat exchanger 310 are connected to form a first heating circuit, capable of supplying heat to the user end. The buffer water tank 410, as an intermediate heat storage unit, provides heat to the user end, buffering fluctuations in heating load and thus improving the stability of the heating temperature, resulting in higher user comfort.

[0050] Optionally, combined Figure 1 As shown, the first heat exchange module 10 also includes a four-way reversing valve 110, a first throttle valve 120, a second heat exchanger 130, and a gas-liquid separator 140. The four-way reversing valve 110 includes a first reversing port (not shown), a second reversing port (not shown), a third reversing port (not shown), and a fourth reversing port (not shown). The first reversing port is connected to the first channel 200. The first throttle valve 120 is connected to the end of the first channel 200 away from the first reversing port. The two ends of the second heat exchanger 130 are respectively connected to the end of the first throttle valve 120 away from the first channel 200 and the third reversing port. The inlet of the gas-liquid separator 140 is connected to the fourth reversing port, and the outlet of the gas-liquid separator 140 is connected to the inlet of the first compressor 100. The outlet of the first compressor 100 is connected to the second reversing port.

[0051] In this embodiment, the four-way reversing valve 110 is used to change the refrigerant flow direction, enabling switching between different operating modes of the heat pump system 1, such as heating mode, cooling mode, and defrosting mode. The first throttle valve 120 is used to throttle and reduce the pressure of the refrigerant, regulating the refrigerant flow rate and phase change state, such as converting liquid refrigerant into a gas-liquid mixture. The second heat exchanger 130 is used as an evaporator or condenser, realizing heat absorption or release according to the switching of the four-way reversing valve 110. For example, in heating mode, the second heat exchanger 130 acts as an evaporator, absorbing heat from the environment; in cooling mode or defrosting mode, the second heat exchanger 130 acts as a condenser, releasing heat to the environment. The gas-liquid separator 140 is used to separate the gaseous and liquid components in the refrigerant, ensuring that only gaseous refrigerant enters the first compressor 100, avoiding liquid slugging.

[0052] In this embodiment, the first heat exchange module 10 integrates a first compressor 100, a four-way reversing valve 110, a first throttle valve 120, a second heat exchanger 130, and a gas-liquid separator 140. By switching the position of the valve core of the four-way reversing valve 110, the flow direction of the refrigerant can be changed, and the heating mode and cooling mode or defrosting mode can be flexibly switched.

[0053] When operating in heating mode, refrigerant flows from the outlet of the first compressor 100, into the second reversing port of the four-way reversing valve 110, and then out through the first reversing port to the first channel 200. At this time, the first channel 200 acts as a condenser, releasing heat to the remaining channels of the multi-channel heat exchanger 20 (such as the second channel 210 and / or the third channel 220). After heat exchange in the first channel 200, the refrigerant flows into the first throttling valve 120 for throttling and pressure reduction, and then flows into the second heat exchanger 130. Here, the second heat exchanger 130 acts as an evaporator, absorbing ambient heat. After heat exchange in the second heat exchanger 130, the refrigerant flows into the third reversing port of the four-way reversing valve 110, and then out through the fourth reversing port to the gas-liquid separator 140 for gas-liquid separation. The separated gaseous refrigerant returns to the first compressor 100, completing the cycle.

[0054] When operating in cooling or defrosting mode, refrigerant flows from the outlet of the first compressor 100, into the second reversing port of the four-way reversing valve 110, and then out through the third reversing port to the second heat exchanger 130. At this time, the second heat exchanger 130 acts as a condenser, releasing heat to the environment. After heat exchange in the second heat exchanger 130, the refrigerant flows into the first throttling valve 120 for throttling and pressure reduction, and then into the first channel 200. Here, the first channel 200 acts as an evaporator, absorbing heat from the other channels of the multi-channel heat exchanger 20. After heat exchange in the first channel 200, the refrigerant flows into the first reversing port of the four-way reversing valve 110, and then out through the fourth reversing port to the gas-liquid separator 140 for gas-liquid separation. The separated gaseous refrigerant returns to the first compressor 100, completing the cycle.

[0055] Optionally, combined Figure 1 As shown, the second heat exchange module 30 also includes a second throttle valve 320. The second throttle valve 320 is located on the pipeline between the first flow path 312 and the third channel 220 of the first heat exchanger 310.

[0056] In this embodiment, the second throttle valve 320 is used to throttle and reduce the pressure of the refrigerant flowing out of the first flow path 312 of the first heat exchanger 310, and to regulate the flow rate and phase change state of the refrigerant, such as converting the high-pressure liquid refrigerant into a low-pressure gas-liquid mixture refrigerant, in order to prepare for subsequent heat exchange in the third channel 220, making full use of the latent heat absorption capacity and improving the heat exchange efficiency of the second heat exchange module 30.

[0057] Optionally, combined Figure 1As shown, the third heat exchange module 40 also includes a first pump body 420. The first pump body 420 is located on the pipeline between the first circulation port of the buffer water tank 410 and the second flow path 314 of the first heat exchanger 310, and / or on the pipeline between the second flow path 314 of the first heat exchanger 310 and the second circulation port of the buffer water tank 410.

[0058] In this embodiment, by setting a first pump body 420 to drive the heat transfer medium (such as water) in the first heating circuit to circulate in a forced manner, the flow rate of the heat transfer medium in the first heating circuit is enhanced, the heat exchange efficiency of the first heating circuit is enhanced, and the overall energy efficiency and response speed of the heat pump system 1 are improved, thereby enhancing the user experience.

[0059] Optionally, combined Figure 1 As shown, the first circulation port of the buffer water tank 410, the second channel 210 and the second circulation port of the buffer water tank 410 are connected in sequence through pipelines to form a third heating circuit.

[0060] In this embodiment, a third heating loop is formed by connecting the first circulation port and the second channel 210 of the buffer water tank 410 through a pipeline. This achieves a direct heat exchange path between the buffer water tank 410 and the second channel 210 of the multi-channel heat exchanger 20, providing a new and efficient heating path for the heat pump system 1 and reducing energy loss during heat transfer. The introduction of the third heating loop allows the buffer water tank 410 to obtain multiple heat sources, including the third heating loop directly connected to the second channel 210, the first heating loop connected to the second flow path 314 of the first heat exchanger 310, and the second heating loop connected to the hot water storage tank 50. The selectivity of multiple heat sources allows the heat pump system 1 to select the input heat source or the number of input heat sources as needed, improving the operational flexibility of the heat pump system 1.

[0061] Optionally, combined Figure 1 As shown, the heat pump system 1 also includes a first switch module 60. One end of the first switch module 60 is connected to the second channel 210, and the other end of the first switch module 60 is connected to the hot water storage tank 50 and the buffer tank 410 respectively.

[0062] In this embodiment, one end of the first switch module 60 is connected to the second channel 210, and the other end of the first switch module 60 is connected to the hot water storage tank 50 and the buffer tank 410 respectively. By setting the first switch module 60, the opening or closing of the third heating circuit and the heat storage circuit can be controlled, thereby achieving precise heat distribution control. For example, by controlling the first switch module 60 to be in the open state, that is, connecting the third heating circuit and the heat storage circuit, the heat transfer medium in the third heating circuit and the heat storage circuit is in a circulating state, so as to convert excess energy into heat and store it in the buffer tank 410 and the hot water storage tank 50. By controlling the first switch module 60 to be in the closed state, that is, disconnecting the third heating circuit and the heat storage circuit, the heat transfer medium in the third heating circuit and the heat storage circuit is in a stagnant state, so as to prevent the buffer tank 410 and the hot water storage tank 50 from absorbing too much heat and affecting the heating at the user end. In this process, the buffer tank 410 exchanges heat with the first circulating circuit through the second circulating circuit, and the first heating circuit absorbs heat by exchanging heat with the second circulating circuit.

[0063] Optionally, combined Figure 1 As shown, the first switch module 60 includes a first shut-off valve 610. One end of the first shut-off valve 610 is connected to the second channel 210, and the other end of the first shut-off valve 610 is connected to the hot water storage tank 50 and the buffer water tank 410 respectively.

[0064] In this embodiment, by setting a first shut-off valve 610 and adjusting the opening degree of the first shut-off valve 610, the opening or closing control of the third heating circuit and the heat storage circuit can be realized, thereby achieving precise heat distribution control.

[0065] Optionally, combined Figure 1 As shown, the first switch module 60 also includes a third pump body 620. The third pump body 620 is connected in parallel with the first shut-off valve 610.

[0066] In this embodiment, the third pump body 620 is connected in parallel with the first shut-off valve 610, enabling the heat pump system 1 to enhance its heating capacity by activating the third pump body 620 when the first shut-off valve 610 cannot meet the heating demand or when more efficient heating is required. Simultaneously, when a single component fails, the parallel connection of the third pump body 620 and the first shut-off valve 610 maintains a stable heating output, improving the reliability of the heat pump system 1 and reducing losses caused by downtime due to malfunctions.

[0067] Optionally, the first switch module 60 further includes a third pump body 620. The third pump body 620 is connected in series with the first shut-off valve 610, and one of the third pump body 620 and the first shut-off valve 610 is connected to the second channel 210, while the other of the two is connected to the hot water storage tank 50 and the buffer water tank 410, respectively.

[0068] In this embodiment, the third pump body 620 serves as an additional heating power source, connected in series with the first shut-off valve 610 to enhance the heating and heat storage capacity of the heat pump system 1. For example, in scenarios requiring a rapid increase in user-end heating or the addition of heat storage tank 50, the activation of the third pump body 620 can quickly improve heat exchange efficiency. Simultaneously, by adjusting the operating parameters of the third pump body 620 and the opening degree of the first shut-off valve 610, heat distribution can be more precisely controlled, reducing energy waste and improving the energy efficiency ratio of the heat pump system 1, thereby achieving a more environmentally friendly and efficient heating method.

[0069] In a specific application, the third pump body 620 is connected in series with the first shut-off valve 610 and is connected to the second channel 210. The end of the first shut-off valve 610 away from the third pump body 620 is connected to the hot water storage tank 50 and the buffer water tank 410 respectively.

[0070] In a specific application, the third pump body 620 is connected in series with the first shut-off valve 610 and the first shut-off valve 610 is connected to the second channel 210. The end of the third pump body 620 away from the first shut-off valve 610 is connected to the hot water storage tank 50 and the buffer tank 410 respectively.

[0071] Optionally, combined Figure 1 As shown, the heat pump system 1 also includes a second shut-off valve 70. The second shut-off valve 70 is located on the pipeline between the buffer water tank 410 and the first switching module 60.

[0072] In this embodiment, by setting the second shut-off valve 70 on the pipeline between the buffer tank 410 and the first switching module 60, an additional control point is added between the first switching module 60 and the buffer tank 410, thereby achieving more precise and flexible control of heat flow. The addition of the second shut-off valve 70 allows the heat pump system 1 to adjust its heating strategy more flexibly in response to different heating demands. By controlling the opening and closing state of the second shut-off valve 70, the opening or closing of the second and third heating circuits can be controlled, achieving more precise heat distribution and enabling multiple heat exchange modes.

[0073] For example, the heat pump system 1 can connect the second heating circuit, the third heating circuit, and the heat storage circuit by opening the first switching module 60 and the second shut-off valve 70, so that the heat transfer medium in the second heating circuit, the third heating circuit, and the heat storage circuit is in a circulating state for heat exchange. The heat pump system 1 can also connect the heat storage circuit and close the second heating circuit and the third heating circuit by opening the first switching module 60 and closing the second shut-off valve 70, so that the heat transfer medium in the heat storage circuit is in a circulating state, while the heat transfer medium in the second heating circuit and the third heating circuit is in a stagnant state. Finally, the heat pump system 1 can also connect the second heating circuit and close the third heating circuit and the heat storage circuit by closing the first switching module 60 and opening the second shut-off valve 70, so that the heat transfer medium in the second heating circuit is in a circulating state, while the heat transfer medium in the third heating circuit and the heat storage circuit is in a stagnant state.

[0074] Optionally, combined Figure 1 As shown, the heat pump system 1 also includes a second switching module 80. One end of the second switching module 80 is connected to the second channel 210 and the buffer water tank 410, respectively, and the other end of the second switching module 80 is connected to the hot water storage tank 50.

[0075] In this embodiment, by setting a second switch module 80, an additional control point is added between the second channel 210 and the buffer water tank 410 and the hot water storage tank 50, which further improves the precise and flexible control of heat flow by the heat pump system 1, enabling the pump system to adjust the heating strategy more flexibly when facing different heating demands.

[0076] For example, heat pump system 1 can connect the second heating circuit, the third heating circuit, and the heat storage circuit by opening the first switching module 60, the second shut-off valve 70, and the second switching module 80, so that the heat transfer medium in the second heating circuit, the third heating circuit, and the heat storage circuit is in a circulating state for heat exchange. Heat pump system 1 can also connect the heat storage circuit and shut down the second heating circuit and the third heating circuit by opening the first switching module 60 and the second switching module 80 and closing the second shut-off valve 70, so that the heat transfer medium in the heat storage circuit is in a circulating state, while the heat transfer medium in the second heating circuit and the third heating circuit is in a stagnant state. Finally, heat pump system 1 can also connect the second heating circuit and shut down the third heating circuit and the heat storage circuit by closing the first switching module 60 and opening the second shut-off valve 70 and the second switching module 80, so that the heat transfer medium in the second heating circuit is in a circulating state, while the heat transfer medium in the third heating circuit and the heat storage circuit is in a stagnant state. The heat pump system 1 can connect the third heating circuit and shut down the second heating circuit and the heat storage circuit by opening the first switch module 60 and the second shut-off valve 70 and closing the second switch module 80, so that the heat transfer medium in the third heating circuit is in a circulating state, while the heat transfer medium in the second heating circuit and the heat storage circuit is in a stagnant state.

[0077] In some embodiments, the specific structure of the second switch module 80 can be referred to the first switch module 60 in the above embodiments, and will not be repeated here.

[0078] Optionally, combined Figure 1 As shown, the second switch module 80 includes a third shut-off valve 810. One end of the third shut-off valve 810 is connected to the second channel 210 and the buffer water tank 410, and the other end of the third shut-off valve 810 is connected to the hot water storage tank 50.

[0079] Optionally, combined Figure 1 As shown, the second switch module 80 also includes a fourth pump body 820. The fourth pump body 820 is connected in parallel with the third shut-off valve 810.

[0080] Optionally, the second switch module 80 also includes a fourth pump body 820. The fourth pump body 820 is connected in series with the third shut-off valve 810, and one of the fourth pump body 820 and the third shut-off valve 810 is connected to the hot water storage tank 50, while the other of the two is connected to the second channel 210 and the buffer water tank 410, respectively.

[0081] In a specific application, the fourth pump body 820 is connected in series with the third shut-off valve 810 and is connected to the hot water storage tank 50. The end of the third shut-off valve 810 away from the fourth pump body 820 is connected to the second channel 210 and the buffer water tank 410 respectively.

[0082] In a specific application, the fourth pump body 820 is connected in series with the third shut-off valve 810 and the third shut-off valve 810 is connected to the hot water storage tank 50. The end of the fourth pump body 820 away from the third shut-off valve 810 is connected to the second channel 210 and the buffer water tank 410 respectively.

[0083] Optionally, combined Figure 1 As shown, the heat pump system 1 also includes a heating module 90. The heating module 90 includes a third heat exchanger 910, the two ends of which are connected to the third circulation port (not shown in the figure) and the fourth circulation port (not shown in the figure) of the buffer water tank 410, respectively.

[0084] In this embodiment, the heating module 90, as a terminal heat exchange device, is configured to supply heat to the user end. The two ends of the third heat exchanger 910 are respectively connected to the third and fourth circulation ports of the buffer water tank 410 via pipelines to form a fourth heating circuit. In this embodiment, the buffer water tank 410, as an intermediate heat hub, can obtain heat through the first, second, and third heating circuits, and also supply heat to the user side through the third heat exchanger 910, achieving multi-mode heat acquisition and distribution.

[0085] Optionally, combined Figure 1 As shown, the heating module 90 also includes a second pump body 920. The second pump body 920 is located on the pipeline between the third circulation port of the buffer water tank 410 and the third heat exchanger 910, and / or on the pipeline between the third heat exchanger 910 and the fourth circulation port of the buffer water tank 410.

[0086] In this embodiment, by setting a second pump body 920, the heat transfer efficiency in the heating module 90 is improved, enabling the heat pump system 1 to respond to heating demand more quickly, transferring heat from the buffer water tank 410 to the third heat exchanger 910, shortening the heating response time, improving heating efficiency and user experience.

[0087] In a specific application, combined Figure 2As shown, the heat pump system 1 includes a first heat exchange module 10, a multi-channel heat exchanger 20, a second heat exchange module 30, a third heat exchange module 40, a hot water storage tank 50, a first switching module 60, a second shut-off valve 70, a second switching module 80, and a heating module 90. The first heat exchange module 10 includes a first compressor 100, a four-way reversing valve 110, a first throttling valve 120, a second heat exchanger 130, and a gas-liquid separator 140. The multi-channel heat exchanger 20 includes a first channel 200, a second channel 210, and a third channel 220. The four-way reversing valve 110 includes a first reversing port, a second reversing port, a third reversing port, and a fourth reversing port. The first reversing port is connected to the first channel 200. The first throttling valve 120 is connected to the end of the first channel 200 away from the first reversing port. The two ends of the second heat exchanger 130 are respectively connected to the end of the first throttling valve 120 away from the first channel 200 and the third reversing port. The inlet of the gas-liquid separator 140 is connected to the fourth reversing port, and the outlet of the gas-liquid separator 140 is connected to the inlet of the first compressor 100. The outlet of the first compressor 100 is connected to the second reversing port. The second heat exchange module 30 includes a second compressor 300, a first heat exchanger 310, and a second throttle valve 320. The second compressor 300, the first flow path 312 of the first heat exchanger 310, the second throttle valve 320, and the third channel 220 are sequentially connected to form a second circulation loop. The third heat exchange module 40 includes a buffer water tank 410 and a first pump body 420. The first circulation port of the buffer water tank 410, the first pump body 420, the second flow path 314 of the first heat exchanger 310, and the second circulation port of the buffer water tank 410 are sequentially connected to form a first heating loop. The hot water storage tank 50 and the buffer water tank 410 are connected to form a second heating loop, and the hot water storage tank 50 and the second channel 210 are connected to form a heat storage loop. The first circulation port, the second channel 210, and the second circulation port of the buffer water tank 410 are sequentially connected by pipelines to form a third heating circuit. The first switch module 60 includes a first shut-off valve 610 and a third pump body 620. One end of the first shut-off valve 610 is connected to the second channel 210, and the other end is connected to both the hot water storage tank 50 and the buffer water tank 410. The third pump body 620 is connected in parallel with the first shut-off valve 610. The second shut-off valve 70 is located on the pipeline between the buffer water tank 410 and the first switch module 60. The second switch module 80 includes a third shut-off valve 810 and a fourth pump body 820. One end of the third shut-off valve 810 is connected to both the second channel 210 and the buffer water tank 410, and the other end is connected to the hot water storage tank 50. The fourth pump body 820 is connected in parallel with the third shut-off valve 810. The heating module 90 includes a third heat exchanger 910 and a second pump body 920, and the third heat exchanger 910, the second pump body 920 and the buffer water tank 410 are connected in sequence.

[0088] In this embodiment, the heat pump system 1 can adjust the on / off states of each pump body, switch module, and shut-off valve according to user needs and the temperature of the hot water storage tank 50, while simultaneously controlling the start and stop of the first compressor 100 and the second compressor 300 to achieve switching between different operating modes of the heat pump system 1. For details, please refer to the control method of the heat pump system 1 in the following embodiment.

[0089] In some embodiments, a control method for a heat pump system is provided, comprising: obtaining the power input power of the heat pump system; obtaining the minimum heat storage temperature Tmin, the maximum heat storage temperature Tmax, and the minimum heating temperature Tc of the hot water storage tank; wherein, the minimum heat storage temperature Tmin < the minimum heating temperature Tc < the maximum heat storage temperature Tmax; obtaining the real-time temperature T of the hot water storage tank; and operating a first mode when the heat pump system is running in heating mode, the power input power > the power threshold, and the real-time temperature T < the maximum heat storage temperature Tmax; operating the first mode includes: turning on the first compressor, the second compressor, the first pump body, the second pump body, the third shut-off valve, the fourth pump body, and the second shut-off valve, and turning off the first shut-off valve and the third pump body;

[0090] In this embodiment, the minimum heat storage temperature Tmin and the maximum heat storage temperature Tmax of the hot water storage tank can be determined based on the heat transfer medium in the tank. For example, when the heat transfer medium is water, the minimum heat storage temperature Tmin can be 0°C, and the maximum heat storage temperature Tmax can be 100°C. The minimum heating temperature Tc refers to the lowest temperature at which the hot water storage tank can release heat to the buffer tank after the user sets their desired heating temperature. The mapping relationship between the minimum heating temperature Tc and the user-set heating temperature can be obtained by technicians based on actual heat pump system experiments. For example, when the user sets a heating temperature of 40°C, the minimum heating temperature Tc is 60°C; when the user sets a heating temperature of 60°C, the minimum heating temperature Tc is 80°C. The power threshold is preset by technicians based on the actual heat pump system and is used to determine the current power input. When the power input exceeds the power threshold, it indicates that the power input is too high, which can easily lead to energy waste.

[0091] In this embodiment, such as Figure 2 As shown, where, Figure 3The dashed line with arrows indicates the flow direction of refrigerant or heat transfer medium in heat pump system 1. When heat pump system 1 is operating in heating mode, the power input is greater than the power threshold, and the real-time temperature T is less than the maximum heat storage temperature Tmax, the first mode is operated. This involves turning on the first compressor 100, the second-stage compressor, the first pump body 420, the second pump body 920, the second switching module 80 (the third shut-off valve 810 and the fourth pump body 820), and the second shut-off valve 70, while closing the first switching module 60 (the first shut-off valve 610 and the third pump body 620). This allows the low-temperature refrigerant to be heated and pressurized by the first compressor 100, then enter the first channel 200 of the multi-channel heat exchanger 20 through the first reversing port of the four-way reversing valve 110 to release heat. After that, it is cooled and depressurized by the first throttling valve 120 and returns to the second heat exchanger 130 to complete the refrigerant cycle. In the second circulation loop, the low-temperature refrigerant exchanges heat with the refrigerant in the first channel 200 through the third channel 220 of the multi-channel heat exchanger 20. After absorbing heat, it is then heated and pressurized by the second compressor 300, and then heat-exchanged through the first heat exchanger 310. Finally, it is cooled and depressurized through the second throttle valve 320 and returns to the first heat exchanger 310 to complete the refrigerant cycle. In the first heating loop, the heat transfer medium exchanges heat with the refrigerant in the second circulation loop through the first heat exchanger 310. After absorbing heat, it is circulated by the first pump body 420 to the buffer water tank 410. Then, the second pump body 920 circulates the heat transfer medium inside the buffer water tank 410 to the third heat exchanger 910 to supply heat to the user.

[0092] In some embodiments, a control method for a heat pump system is provided, comprising: obtaining a minimum heat storage temperature Tmin, a maximum heat storage temperature Tmax, and a minimum heating temperature Tc of a hot water storage tank; wherein, the minimum heat storage temperature Tmin < the minimum heating temperature Tc < the maximum heat storage temperature Tmax; obtaining the real-time temperature T of the hot water storage tank; and, when the heat pump system is operating in heating mode, the power input power ≤ a power threshold, and the minimum heating temperature Tc ≤ the real-time temperature T, operating in a second mode; operating in the second mode includes: shutting down the first compressor, the second-stage compressor, the first pump body, the first shut-off valve, the third pump body, and the third shut-off valve, and opening the second pump body, the fourth pump body, and the second shut-off valve.

[0093] In this embodiment, such as Figure 3 As shown, where, Figure 4 The dashed line with arrows indicates the flow direction of refrigerant or heat transfer medium in heat pump system 1. When heat pump system 1 is operating in heating mode, the power input power is less than or equal to the power threshold, and the minimum heating temperature Tc is less than or equal to the real-time temperature T, the second mode is operated. The heat transfer medium in the storage tank 50 is circulated to the buffer tank 410 by the fourth pump body 820, and then circulated to the third heat exchanger 910 by the second pump body 920 to provide heat to the user.

[0094] In some embodiments, a control method for a heat pump system is provided, comprising: obtaining a minimum heat storage temperature Tmin, a maximum heat storage temperature Tmax, and a minimum heating temperature Tc of a hot water storage tank; wherein, the minimum heat storage temperature Tmin < the minimum heating temperature Tc < the maximum heat storage temperature Tmax; obtaining the real-time temperature T of the hot water storage tank; and when the heat pump system is operating in heating mode, the power input power ≤ a power threshold, and the minimum heat storage temperature Tmin ≤ the real-time temperature T < the minimum heating temperature Tc, operating in a third mode; operating in the third mode includes: shutting down the first compressor, the third pump body, the second shut-off valve, and the third shut-off valve, and opening the second-stage compressor, the first pump body, the second pump body, the fourth pump body, and the first shut-off valve.

[0095] In this embodiment, such as Figure 4 As shown, where, Figure 2 The dashed lines with arrows indicate the flow direction of refrigerant or heat transfer medium in heat pump system 1. When heat pump system 1 operates in heating mode, with power input power ≤ power threshold and minimum heat storage temperature Tmin ≤ real-time temperature T < minimum heating temperature Tc, it operates in third mode. This utilizes the fourth pump body 820 to circulate the heat transfer medium in the hot water storage tank 50 to the second channel 210 of the multi-channel heat exchanger 20, where the heat transfer medium undergoes heat exchange. The refrigerant in the second circulation loop absorbs heat through the multi-channel heat exchanger 20 and then enters the second compressor 300 for temperature and pressure increase, before entering the first heat exchanger 310 for heat exchange. The heat transfer medium in the first heating loop absorbs heat through the first heat exchanger 310 and is circulated by the first pump body 420 to the buffer tank 410, and then circulated through the second pump body 920 to the third heat exchanger 910 to supply heat to the user.

[0096] In some embodiments, a control method for a heat pump system is provided, comprising: obtaining a minimum heat storage temperature Tmin, a maximum heat storage temperature Tmax, and a minimum heating temperature Tc of a hot water storage tank; wherein, the minimum heat storage temperature Tmin < the minimum heating temperature Tc < the maximum heat storage temperature Tmax; obtaining the real-time temperature T of the hot water storage tank; and when the heat pump system is operating in heating mode, the power input power is ≤ a power threshold, and the real-time temperature T < the minimum heat storage temperature Tmin, operating in a fourth mode; operating in the fourth mode includes: turning on the first compressor, the second-stage compressor, the first pump body, and the second pump body, and turning off the third pump body, the second shut-off valve, the third shut-off valve, the fourth pump body, and the first shut-off valve.

[0097] In this embodiment, such as Figure 2 As shown, where, Figure 5The dashed lines with arrows indicate the flow direction of refrigerant or heat transfer medium in heat pump system 1. When heat pump system 1 operates in heating mode, the power input is less than or equal to the power threshold, and the real-time temperature T is less than the minimum heat storage temperature Tmin, it operates in fourth mode. This allows the low-temperature refrigerant to be heated and pressurized by the first compressor 100, then enter the multi-channel heat exchanger 20 through the first reversing port of the four-way reversing valve 110 to release heat. It then cools and depressurizes through the first throttle valve 120 and returns to the second heat exchanger 130 to complete the refrigerant cycle. In the second circulation loop, the refrigerant absorbs heat through the multi-channel heat exchanger 20, is heated and pressurized by the second compressor 300, and then exchanges heat through the first heat exchanger 310. The first heating loop uses the first pump body 420 to circulate the heat transfer medium, after absorbing heat in the first heat exchanger 310, to the buffer water tank 410, and then through the second pump body 920 to the third heat exchanger 910 to supply heat to the user.

[0098] In some embodiments, a control method for a heat pump system is provided, comprising: operating a fifth mode when the heat pump system is operating in a cooling mode; operating the fifth mode includes: turning on a first compressor, a first pump body, a second pump body, and a third pump body, and turning off a second-stage compressor, a second shut-off valve, a third shut-off valve, a fourth pump body, and a first shut-off valve.

[0099] In this embodiment, such as Figure 5 As shown, where, ​ The dashed line with arrows indicates the flow direction of the refrigerant or heat transfer medium in the heat pump system 1. When the heat pump system 1 is running in cooling mode, it operates in the fifth mode, so that the low-temperature refrigerant enters the second heat exchanger 130 through the third reversing port of the four-way reversing valve 110, and then absorbs heat through the multi-channel heat exchanger 20. At the same time, the third pump body 620 circulates the heat transfer medium in the buffer water tank 410 to the multi-channel heat exchanger 20 for heat exchange. The second pump body 920 then circulates the cooled heat transfer medium in the buffer water tank 410 back to the third heat exchanger 910 to cool the user.

[0100] The foregoing description and accompanying drawings fully illustrate embodiments of the present disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the order of operation may vary. Parts and features of some embodiments may be included or substituted for parts and features of other embodiments. Embodiments of the present disclosure are not limited to the structures described above and shown in the accompanying drawings, and various modifications and changes may be made without departing from its scope. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A heat pump system, characterized by, Comprise: The first heat exchange module comprises a first compressor; The multi-channel heat exchanger comprises a first channel, a second channel and a third channel, the first channel and the first compressor are communicated to form a first circulation loop; The second heat exchange module comprises a second compressor and a first heat exchanger, the second compressor, the first flow path of the first heat exchanger and the third channel are communicated in sequence to form a second circulation loop; The third heat exchange module comprises a buffer water tank, the first circulation port of the buffer water tank, the second flow path of the first heat exchanger and the second circulation port of the buffer water tank are communicated in sequence to form a first heat supply loop; The heat storage water tank and the buffer water tank are communicated to form a second heat supply loop, and the heat storage water tank and the second channel are communicated to form a heat storage loop.

2. The heat pump system of claim 1, wherein, The first circulation port of the buffer water tank, the second channel and the second circulation port of the buffer water tank are communicated in sequence to form a third heat supply loop.

3. The heat pump system according to claim 1 or 2, characterized in that, The first heat exchange module further comprises: The four-way reversing valve comprises a first reversing port, a second reversing port, a third reversing port and a fourth reversing port, the first reversing port is communicated with the first channel; The first throttling valve is communicated with the end of the first channel away from the first reversing port; The second heat exchanger is communicated with the end of the first throttling valve away from the first channel and the third reversing port respectively; The gas-liquid separator is communicated with the fourth reversing port at the inlet, and the outlet of the gas-liquid separator is communicated with the inlet of the first compressor; The outlet of the first compressor is communicated with the second reversing port.

4. The heat pump system according to claim 1 or 2, characterized in that, The second heat exchange module further comprises: The second throttling valve is located on the pipeline between the first flow path of the first heat exchanger and the third channel.

5. The heat pump system according to claim 1 or 2, characterized by, The third heat exchange module further comprises: The first pump body is located on the pipeline between the first circulation port of the buffer water tank and the second flow path of the first heat exchanger, and / or on the pipeline between the second flow path of the first heat exchanger and the second circulation port of the buffer water tank.

6. The heat pump system according to claim 1 or 2, characterized by, Further comprising: The heat supply module comprises a third heat exchanger, and the two ends of the third heat exchanger are communicated with the third circulation port and the fourth circulation port of the buffer water tank respectively.

7. The heat pump system of claim 6, wherein, The heat supply module further comprises: The second pump body is located on the pipeline between the third circulation port of the buffer water tank and the third heat exchanger, and / or on the pipeline between the third heat exchanger and the fourth circulation port of the buffer water tank.

8. The heat pump system according to claim 1 or 2, characterized by, Further comprising: The first switch module is communicated with the second channel at one end, and is communicated with the heat storage water tank and the buffer water tank at the other end respectively; And / or, The second switch module is communicated with the second channel and the buffer water tank at one end respectively, and is communicated with the heat storage water tank at the other end.

9. The heat pump system according to claim 8, wherein The first switch module comprises a first stop valve, one end of the first stop valve is communicated with the second channel, and the other end of the first stop valve is communicated with the heat storage water tank and the buffer water tank respectively; or The first switch module comprises a first stop valve and a third pump body, one end of the first stop valve is communicated with the second channel, the other end of the first stop valve is communicated with the heat storage water tank and the buffer water tank respectively, and the third pump body is connected in parallel with the first stop valve.

10. The heat pump system of claim 8, wherein, The heat pump system comprises a first switch module; The heat pump system further comprises: A second stop valve is arranged on the pipeline between the buffer water tank and the first switch module.

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