Stepless refrigerating and heating adjusting system

Abstract

The invention discloses a stepless refrigerating and heating adjusting system, and relates to the technical field of heat pumps. Wherein the first branch comprises a compressor, a refrigeration heat exchanger and a refrigeration expansion valve which are sequentially connected in series; each second branch comprises a one-way control piece, a three-way valve, a heat exchanger and an expansion valve, the three-way valves, the heat exchangers and the expansion valves are sequentially connected in series, the one-way control pieces are connected with the expansion valves in parallel, and the one-way control pieces are communicated from one ends close to the heat exchangers to the other ends; one end, far away from the heat exchanger, of the expansion valve is communicated with one end, far away from the refrigeration heat exchanger, of the refrigeration expansion valve, and the two heat exchangers are a heating heat exchanger and a heat balance heat exchanger respectively; and the expansion valve and the refrigeration expansion valve are electrically driven. Various operation conditions can be provided, cold and heat requirements can be met, energy recovery is achieved, and therefore the operation stability and the energy utilization rate are improved, and the cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of heat pumps, and particularly to a stepless refrigeration and heating regulation system. Background Art

[0002] At present, the four-pipe heat pump units on the market can provide a heating heat source for free while cooling and dehumidifying with cold water, which can effectively meet the dual needs of users for both cooling and heating, and can also save the operation cost of the equipment and the initial investment cost of the equipment. However, the four-pipe heat pump units currently in use generally have the following technical problems: the structure design is complex, the regulation is not flexible, and when the cooling and heating requirements do not match, the heat pump unit needs to repeatedly switch the operation mode, which will lead to system instability, high equipment cost, and it is difficult to be popularized in the market. Therefore, the existing heat pump equipment needs to be further optimized. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. For this purpose, the present invention provides a stepless refrigeration and heating regulation system, which can provide a variety of operating conditions, effectively match the cooling and heating requirements, and at the same time, can realize energy recovery and utilization, thereby improving the system operation stability and energy utilization rate, and reducing the system cost.

[0004] An embodiment of the present invention provides a stepless refrigeration and heating regulation system, which includes: A first branch, which includes a compressor, a refrigeration heat exchanger, and a refrigeration expansion valve connected in series in sequence; Two second branches, each of the second branches includes a one-way control member and a three-way valve, a heat exchanger, and an expansion valve connected in series in sequence. The one-way control member is connected in parallel to the expansion valve, and the conduction direction of the one-way control member is from the end close to the heat exchanger to the other end; Wherein, the other two interfaces of each three-way valve are respectively communicated with the suction port and the discharge port of the compressor. The interface of each three-way valve communicated with the heat exchanger is switched to conduct to one of the other two interfaces. One end of each expansion valve away from the heat exchanger is communicated with one end of the refrigeration expansion valve away from the refrigeration heat exchanger. The two heat exchangers are a heating heat exchanger and a heat balance heat exchanger respectively, and the expansion valve and the refrigeration expansion valve are electrically driven.

[0005] The stepless refrigeration and heating regulation system according to the embodiments of the present invention has at least the following beneficial effects: Since both the expansion valve and the refrigeration expansion valve are electrically driven, and at the same time, the heat exchanger can be conducted to the suction port or the discharge port of the compressor through the three-way valve. Therefore, by switching the three-way valve and controlling the opening and closing of the two expansion valves and the refrigeration expansion valve, at least two of the refrigeration heat exchanger and the two heat exchangers can be selected and controlled to operate, so that the stepless refrigeration and heating regulation system can provide multiple operating modes such as simultaneous refrigeration and heating mode, single refrigeration mode, single heating mode, refrigeration-based and heating-assisted mode, heating-based and refrigeration-assisted mode, and defrosting mode, etc., so that flexible adjustment of working conditions can be realized, effectively matching the actual cooling and heating requirements, and avoiding the problem of poor system operation stability caused by repeated switching of operating modes; in the refrigeration-based and heating-assisted mode or the heating-based and refrigeration-assisted mode, the refrigerant flow rate can be adjusted in real time by controlling the opening degrees of the expansion valve and the refrigeration expansion valve to dynamically match the system requirements, so as to realize the recovery and utilization of energy and adjust the amount of recovered energy, improving the energy utilization efficiency.

[0006] Moreover, with the above structural design, the stepless refrigeration and heating regulation system can simplify the pipeline and reduce the components, thus reducing the manufacturing cost of the system.

[0007] In some embodiments of the present invention, at least one of the second branches is connected in series with a flow control valve, and the flow control valve is configured to be able to adjust the refrigerant flow rate flowing into the second branch.

[0008] In some embodiments of the present invention, one of the other two interfaces of the three-way valve is connected to the suction port of the compressor, and the other is sequentially connected in series to the flow control valve and the discharge port of the compressor.

[0009] In some embodiments of the present invention, the stepless refrigeration and heating regulation system has a simultaneous refrigeration and heating mode. In the simultaneous refrigeration and heating mode, the refrigeration expansion valve is configured to be in an open state, the two expansion valves are configured to be in a closed state, and the three-way valve on the second branch where the heating heat exchanger is located is configured to be conducted to the discharge port of the compressor, and the three-way valve on the second branch where the heat balance heat exchanger is located is configured to be conducted to the suction port of the compressor.

[0010] In some embodiments of the present invention, the stepless refrigeration and heating regulation system has a single refrigeration mode. In the single refrigeration mode, the refrigeration expansion valve is configured to be in an open state, the two expansion valves are configured to be in a closed state, and the three-way valve on the second branch where the heat balance heat exchanger is located is configured to be conducted to the discharge port of the compressor, and the three-way valve on the second branch where the heating heat exchanger is located is configured to be conducted to the suction port of the compressor.

[0011] In some embodiments of the present invention, the stepless refrigeration and heating adjustment system has a separate heating mode. In the separate heating mode, the refrigeration expansion valve is configured to be in a closed state. For the second branch where the heating heat exchanger is located, the three-way valve is configured to conduct to the exhaust port of the compressor, and the expansion valve is configured to be in a closed state; for the second branch where the heat balance heat exchanger is located, the three-way valve is configured to conduct to the suction port of the compressor, and the expansion valve is configured to be in an open state.

[0012] In some embodiments of the present invention, the stepless refrigeration and heating adjustment system has a refrigeration-based and heating-assisted mode. In the refrigeration-based and heating-assisted mode, the refrigeration expansion valve is configured to be in an open state, the two three-way valves are configured to conduct to the exhaust port of the compressor, and the two expansion valves are configured to be in a closed state.

[0013] In some embodiments of the present invention, the stepless refrigeration and heating adjustment system has a heating-based and refrigeration-assisted mode. In the heating-based and refrigeration-assisted mode, the refrigeration expansion valve is configured to be in an open state. For the second branch where the heating heat exchanger is located, the three-way valve is configured to conduct to the exhaust port of the compressor, and the expansion valve is configured to be in a closed state; for the second branch where the heat balance heat exchanger is located, the three-way valve is configured to conduct to the suction port of the compressor, and the expansion valve is configured to be in an open state.

[0014] In some embodiments of the present invention, the stepless refrigeration and heating adjustment system has a defrosting mode. In the defrosting mode, the refrigeration expansion valve is configured to be in a closed state. For the second branch where the heat balance heat exchanger is located, the three-way valve is configured to conduct to the exhaust port of the compressor, and the expansion valve is configured to be in a closed state; for the second branch where the heating heat exchanger is located, the three-way valve is configured to conduct to the suction port of the compressor, and the expansion valve is configured to be in an open state.

[0015] In some embodiments of the present invention, the one-way control member is a one-way valve.

[0016] Other features and advantages of the present invention will be described in the subsequent description, and in part, will be obvious from the description, or will be understood by implementing the present invention. The objectives and other advantages of the present invention can be achieved and obtained through the structures specifically pointed out in the description, claims, and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of a stepless refrigeration and heating adjustment system provided according to an embodiment of the present invention; Figure 2 It is a schematic diagram of the refrigerant flow direction of the stepless refrigeration and heating adjustment system provided by an embodiment of the present invention in the simultaneous refrigeration and heating mode and when the heat balance heat exchanger is in a non-operating state; Figure 3 It is a schematic diagram of the refrigerant flow direction of the stepless refrigeration and heating adjustment system provided by an embodiment of the present invention in the single refrigeration mode; Figure 4 It is a schematic diagram of the refrigerant flow direction of the stepless refrigeration and heating adjustment system provided by an embodiment of the present invention in the single heating mode; Figure 5 It is a schematic diagram of the refrigerant flow direction of the stepless refrigeration and heating adjustment system provided by an embodiment of the present invention in the refrigeration-dominant and heating-supplementary mode and when the heat balance heat exchanger is in the heat dissipation mode; Figure 6 It is a schematic diagram of the refrigerant flow direction of the stepless refrigeration and heating adjustment system provided by an embodiment of the present invention in the heating-dominant and refrigeration-supplementary mode and when the heat balance heat exchanger is in the heat absorption mode; Figure 7 It is a schematic diagram of the refrigerant flow direction of the stepless refrigeration and heating adjustment system provided by an embodiment of the present invention in the single heating mode and when the heat balance heat exchanger is in the heat dissipation and defrosting mode.

[0018] Reference numerals: 100, compressor; 110, exhaust port; 120, suction port; 210, refrigeration heat exchanger; 220, heat balance heat exchanger; 230, heating heat exchanger; 310, refrigeration expansion valve; 320, heat balance expansion valve; 330, heating expansion valve; 410, first one-way valve; 420, second one-way valve; 510, first three-way valve; 520, second three-way valve; 600, flow control valve; 700, fan. Detailed Description of the Invention

[0019] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation of the present invention.

[0020] In the description of the present invention, it should be understood that the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0021] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "connected" and "connected" 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 directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] Currently, the demand for building energy conservation is also increasing. The specific goal of the high-quality development in the building field is to vigorously promote the realization of low-carbon and healthy buildings. Therefore, the demand for recycling the waste heat of air conditioners or using a set of equipment to provide both cooling and heating for buildings has increased sharply.

[0023] At present, the four-pipe heat pump units on the market can not only meet the dual needs of users for simultaneous cooling and heating, but also save the operating cost of the equipment and the initial investment of the equipment because they can provide a heating heat source for free while providing the function of cooling and dehumidifying through cold water. However, the currently commonly used four-pipe heat pump units all have the following disadvantages: the structural design of the unit is relatively complex, the flexibility of operating condition adjustment is insufficient, and when the actual cooling capacity and heating capacity requirements cannot be effectively matched, the heat pump unit needs to repeatedly switch the operating mode, which will reduce the operating stability of the system. At the same time, the cost of the equipment is relatively high and it is difficult to be popularized in the market. Therefore, the structural design of the existing heat pump equipment urgently needs further improvement and optimization.

[0024] Based on this, the present invention provides a stepless cooling and heating regulation system, which can provide a variety of operating conditions to meet the user's usage needs. Moreover, it can effectively match the actual cooling and heating requirements, and at the same time, it can carry out energy recovery and utilization, so as to improve the operating stability of the system and the energy utilization rate, and achieve the purpose of energy conservation and cost reduction.

[0025] The following refers to Figures 1 to 7 Describe the stepless cooling and heating regulation system provided according to the embodiments of the present invention.

[0026] As Figures 1 to 7 shown, the stepless cooling and heating regulation system according to Embodiment 1 of the present invention has the advantages of simple structural design, multiple operating modes, flexible operating condition adjustment, good operating stability, high energy utilization rate and low cost. Moreover, it is applicable to air source heat pumps, water source heat pumps, evaporative cooling heat pumps, and composite heat pumps of air source + water source.

[0027] The stepless cooling and heating regulation system provided by Embodiment 1 includes a first branch and a second branch.

[0028] The first branch includes a compressor 100, a refrigeration heat exchanger 210, and a refrigeration expansion valve 310. Among them, the compressor 100, the refrigeration heat exchanger 210, and the refrigeration expansion valve 310 are connected in series in sequence through pipelines, thus jointly forming the first branch. The refrigeration expansion valve 310 is electrically driven, capable of opening and closing, and can adjust its own opening degree. Specifically, the refrigeration expansion valve 310 is an electromagnetic electronic expansion valve or an electric electronic expansion valve. The refrigeration expansion valve 310 can control the flow rate of the refrigerant (i.e., the refrigerant) through an electrical signal, and can adjust the valve opening degree in real time according to the preset program or the feedback of the sensor, so as to achieve precise control of the liquid supply volume of the refrigeration heat exchanger 210.

[0029] It can be understood that the compressor 100, as a core component in the stepless refrigeration and heating adjustment system, has a suction port 120 and a discharge port 110. The refrigerant flows into the compressor 100 through the suction port 120. The compressor 100 can compress the low-temperature and low-pressure gaseous refrigerant from the refrigeration heat exchanger 210 into a high-temperature and high-pressure gaseous refrigerant, and can push the refrigerant to continuously flow and exchange energy in the pipeline. The compressed refrigerant will flow out of the compressor 100 through the discharge port 110.

[0030] The refrigerant in the refrigeration heat exchanger 210 (i.e., the evaporator) can provide cooling capacity for the outside, evaporates by absorbing external heat. The outlet end of the refrigeration heat exchanger 210 is connected to the suction port 120 of the compressor 100 through a pipeline, so that the gaseous refrigerant after absorbing heat and evaporating can flow into the compressor 100. The inlet end of the refrigeration heat exchanger 210 is connected to the outlet end of the refrigeration expansion valve 310 through a pipeline. The refrigerant will be throttled and depressurized during the process of flowing through the refrigeration expansion valve 310, so that the pressure and temperature of the refrigerant both decrease, so that the refrigerant can transfer the cooling capacity to the outside at the refrigeration heat exchanger 210. Therefore, by operating the refrigeration heat exchanger 210, the refrigeration function can be provided for users.

[0031] There are two second branches. The two second branches are connected in parallel and then connected in series with the first branch.

[0032] Specifically, each second branch includes a one-way control component, a three-way valve, a heat exchanger, and an expansion valve. Among them, the three-way valve, the heat exchanger, and the expansion valve are connected in series in sequence through pipelines. Moreover, the one-way control component and the expansion valve are connected in parallel through pipelines, thus jointly forming the second branch. The conduction direction of the one-way control component is from the end close to the heat exchanger towards the other end.

[0033] In this embodiment, the one-way control component is a one-way valve (also known as a check valve or non-return valve), which can control the one-way flow of the refrigerant and does not require electric control for opening and closing, thus simplifying the control strategy. The expansion valve is electrically driven and can switch between an open state and a closed state and can adjust its own opening degree. Specifically, the expansion valve is an electromagnetic electronic expansion valve or an electric electronic expansion valve. The expansion valve can control the flow rate of the refrigerant (i.e., the refrigerant) through an electric signal and can adjust the valve opening degree in real time according to a preset program or the feedback of a sensor, so as to achieve precise control of the liquid supply amount of the heat exchanger.

[0034] It can be understood that the one-way control component and the expansion valve are connected in parallel, which can control whether the refrigerant in the second branch flows to the expansion valve or to the one-way control component, and further control whether the refrigerant needs to be throttled and depressurized. When the heat exchanger is used as a condenser, the refrigerant flowing out of the heat exchanger can directly flow to the one-way control component instead of flowing to the expansion valve; when the heat exchanger is used as an evaporator, the refrigerant flowing to the heat exchanger needs to pass through the expansion valve instead of flowing through the one-way control component. Therefore, the temperature and pressure of the refrigerant decrease under the throttling and depressurizing effect, enabling the refrigerant to provide cooling capacity at the heat exchanger.

[0035] Therefore, when the one-way control component is used in combination with the expansion valve, it can control the heat exchanger to switch between an evaporator and a condenser. At the same time, the expansion valve and the refrigeration expansion valve 310 can electrically control their own opening and closing states, and can control the operating states (i.e., the working state and the non-working state) of the two heat exchangers and the refrigeration heat exchanger 210, which helps to realize that the stepless refrigeration and heating regulation system provides multiple operating modes to meet the actual use needs.

[0036] Of course, it is not excluded that in other embodiments, the one-way control component is an electric valve. When the heat exchanger needs to be used as an evaporator, the electric valve is in the closed state and the expansion valve is in the open state, so that the refrigerant can flow through the expansion valve; when the heat exchanger is used as a condenser, the electric valve is in the open state and the expansion valve is in the closed state, so that the refrigerant can flow through the electric valve.

[0037] One interface of each three-way valve is connected to one end of the heat exchanger, and the other end of the heat exchanger is simultaneously connected to one end of the expansion valve and one end of the one-way control component. The other end of the expansion valve is connected to the other end of the one-way control component. The remaining two interfaces of each three-way valve are respectively connected to the suction port 120 and the discharge port 110 of the compressor 100. Moreover, the interface of each three-way valve connected to the heat exchanger can be switched to conduct to one of the other two interfaces of the three-way valve. One end of each expansion valve far from the heat exchanger is connected to one end of the refrigeration expansion valve 310 far from the refrigeration heat exchanger 210.

[0038] It can be understood that the three-way valve is a reversing valve with three interfaces, and one of the interfaces can be switched to conduct to any one of the other two interfaces. The three-way valve can change the flow direction of the refrigerant by changing the position of the valve core, achieving the purpose of switching the flow path of the refrigerant, and thus can cooperate with the one-way control member, the expansion valve, and the refrigeration expansion valve 310, which helps to realize that the stepless refrigeration and heating regulation system provides multiple operation modes to meet the actual use needs of users.

[0039] In this embodiment, each three-way valve has three interfaces, namely interface a, interface b, and interface c. Among them, interface a is connected to the exhaust port 110 of the compressor 100 through a pipeline, interface b is connected to the end of the heat exchanger far from the expansion valve through a pipeline, and interface c is connected to the suction port 120 of the compressor 100 through a pipeline. Interface b can be switched to conduct to interface a or interface c, that is, the end of the heat exchanger far from the expansion valve can be connected to the suction port 120 or the exhaust port 110 of the compressor 100 under the switching action of the three-way valve.

[0040] It can be understood that under the logical control of the actuator supporting the three-way valve, interface a and interface b can be connected in the power-off state, and interface b and interface c can be connected in the power-on state; or, interface a and interface b are connected in the power-on state, and interface b and interface c are connected in the power-off state.

[0041] The two heat exchangers are respectively a heating heat exchanger 230 and a heat balance heat exchanger 220. Among them, the refrigerant in the heating heat exchanger 230 (i.e., the condenser) can provide heating capacity for the outside and undergoes a temperature drop by releasing heat to the outside. By operating the heating heat exchanger 230, the heating function can be provided for users.

[0042] The heat balance heat exchanger 220 can stop operating or can be switched between the evaporator and the condenser for use in cooperation with the refrigeration heat exchanger 210 and / or the heating heat exchanger 230, which helps to realize that the stepless refrigeration and heating regulation system provides multiple operation modes to meet the actual use needs of users. When the heat balance heat exchanger 220 is used as an evaporator, the refrigerant flowing through the heat balance heat exchanger 220 will provide cooling capacity, and the cooling capacity can be dissipated to the outside or can be recycled, such as for pre-cooling treatment of air or water; when the heat balance heat exchanger 220 is used as a condenser, the refrigerant flowing through the heat balance heat exchanger 220 will provide heating capacity, and the heating capacity can be dissipated to the outside or can be recycled, such as for pre-heating treatment of air or water.

[0043] In this embodiment, as Figure 1As shown, for one of the second branches, the heat exchanger is set as the heat balance heat exchanger 220, the three-way valve is set as the first three-way valve 510, the one-way control component is set as the first one-way valve 410, and the expansion valve is set as the heat balance expansion valve 320. The interface a of the first three-way valve 510 is connected to the exhaust port 110 of the compressor 100 through a pipeline. The interface c of the first three-way valve 510 is connected to the suction port 120 of the compressor 100 through a pipeline. The interface b of the first three-way valve 510 is connected to one port of the heat balance heat exchanger 220 through a pipeline. The other port of the heat balance heat exchanger 220 is connected to one port of the heat balance expansion valve 320 and the inlet end of the first one-way valve 410 through a pipeline at the same time. The outlet end of the first one-way valve 410 is connected to the other port of the heat balance expansion valve 320 through a pipeline and is connected to the port of the refrigeration expansion valve 310 far away from the refrigeration heat exchanger 210.

[0044] When the heat balance heat exchanger 220 is used as an evaporator, the interface b of the first three-way valve 510 is switched to conduct to the interface c, the first one-way valve 410 is in a non-working state, and the heat balance expansion valve 320 is in a working state; when the heat balance heat exchanger 220 is used as a condenser, the interface b of the first three-way valve 510 is switched to conduct to the interface a, the first one-way valve 410 is in a working state, and the heat balance expansion valve 320 is in a non-working state.

[0045] For the other second branch, the heat exchanger is set as the heating heat exchanger 230, the three-way valve is set as the second three-way valve 520, the one-way control component is set as the second one-way valve 420, and the expansion valve is set as the heating expansion valve 330. The interface a of the second three-way valve 520 is connected to the exhaust port 110 of the compressor 100 through a pipeline. The interface c of the second three-way valve 520 is connected to the suction port 120 of the compressor 100 through a pipeline. The interface b of the second three-way valve 520 is connected to one port of the heating heat exchanger 230 through a pipeline. The other port of the heating heat exchanger 230 is connected to one port of the heating expansion valve 330 and the inlet end of the second one-way valve 420 through a pipeline. The outlet end of the second one-way valve 420 is connected to the other port of the heating expansion valve 330 through a pipeline and is connected to the port of the refrigeration expansion valve 310 far away from the refrigeration heat exchanger 210.

[0046] When the heating heat exchanger 230 operates and provides heating capacity, the interface b of the second three-way valve 520 is switched to conduct to the interface a, the second one-way valve 420 is in a working state, and the heating expansion valve 330 is in a non-working state; when the heating heat exchanger 230 is used as an evaporator in the defrosting mode, the interface b of the second three-way valve 520 is switched to conduct to the interface c, the second one-way valve 420 is in a non-working state, and the heating expansion valve 330 is in a working state.

[0047] It can be understood that the refrigeration heat exchanger 210, the heating heat exchanger 230, and the heat balance heat exchanger 220 can be finned heat exchangers, shell-and-tube heat exchangers, or double-pipe heat exchangers, etc., which allow the air conditioner refrigerant to exchange heat with media such as water, air, or oil. When the refrigeration heat exchanger 210, the heating heat exchanger 230, and the heat balance heat exchanger 220 adopt finned heat exchangers, a fan 700 is also required, or they are installed in a duct through which air flows. When the refrigeration heat exchanger 210, the heating heat exchanger 230, and the heat balance heat exchanger 220 adopt shell-and-tube heat exchangers or double-pipe heat exchangers, an inlet pipe and an outlet pipe also need to be provided so that the heat exchange liquid can flow through the refrigeration heat exchanger 210, the heating heat exchanger 230, or the heat balance heat exchanger 220.

[0048] The refrigeration expansion valve 310, the heating expansion valve 330, and the heat balance expansion valve 320 can all play the role of throttling and reducing pressure. The refrigeration expansion valve 310 is set for the refrigeration heat exchanger 210 and can apply a throttling effect to the refrigerant flowing into the refrigeration heat exchanger 210 through the refrigeration expansion valve 310; the heating expansion valve 330 is set for the heating heat exchanger 230 and can apply a throttling effect to the refrigerant flowing into the heating heat exchanger 230 through the heating expansion valve 330; the heat balance expansion valve 320 is set for the heat balance heat exchanger 220 and can apply a throttling effect to the refrigerant flowing into the heat balance heat exchanger 220 through the heat balance expansion valve 320.

[0049] In the stepless refrigeration and heating adjustment system provided in the first embodiment, since both expansion valves and the refrigeration expansion valve 310 are electrically driven, and at the same time, the two heat exchangers can be connected to the suction port 120 or the discharge port 110 of the compressor 100 through corresponding three-way valves, therefore, by switching the three-way valves and controlling the opening and closing of the two expansion valves and the refrigeration expansion valve 310, at least two of the refrigeration heat exchanger 210 and the two heat exchangers can be selected and controlled to operate, and at the same time, the flow path of the refrigerant can be adjusted accordingly, so that the stepless refrigeration and heating adjustment system can provide multiple operating modes for users, specifically including simultaneous refrigeration and heating mode, single refrigeration mode, single heating mode, refrigeration-based and heating-assisted mode, heating-based and refrigeration-assisted mode, and defrosting mode, so as to be able to flexibly adjust the operating conditions of the stepless refrigeration and heating adjustment system, effectively match the heat supply and cooling demand, and avoid the problem in the prior art that due to the inability to coordinate and match the cold and heat demands, the heat pump device needs to repeatedly switch operating modes, thereby reducing the operating stability of the heat pump device.

[0050] When the stepless refrigeration and heating regulation system operates in the mode of mainly refrigerating and supplemented by heating or mainly heating and supplemented by refrigerating, the opening degree value of the expansion valve and / or the refrigeration expansion valve 310 can be controlled to regulate the refrigerant flow rate and refrigerating capacity in real time, so as to dynamically match the cooling and heating requirements of the system, and then the cooling energy or heat energy can be recovered and utilized, and the recovery amount of the cooling energy or heat energy can be adjusted, effectively improving the energy utilization efficiency.

[0051] Moreover, the stepless refrigeration and heating regulation system adopts the above structure and is used in cooperation with the refrigeration heat exchanger 210, the heating heat exchanger 230 and the heat balance heat exchanger 220 through the first three-way valve 510, the second three-way valve 520, the refrigeration expansion valve 310, the heating expansion valve 330, the heat balance expansion valve 320, the first check valve 410 and the second check valve 420. It can not only enable the stepless refrigeration and heating regulation system to provide the above-mentioned multiple operation modes and realize the recovery of waste energy, but also simplify the pipeline design of the system, reduce the components of the system, effectively reduce the manufacturing cost of the system, and make the stepless refrigeration and heating regulation system more economically advantageous.

[0052] The stepless refrigeration and heating regulation system has a simultaneous refrigeration and heating mode. In the simultaneous refrigeration and heating mode, as Figure 2 shown, the refrigeration expansion valve 310 is configured to be in an open state, the two expansion valves are configured to be in a closed state, and moreover, the three-way valve on the second branch where the heating heat exchanger 230 is located is configured to conduct to the exhaust port 110 of the compressor 100, and the three-way valve on the second branch where the heat balance heat exchanger 220 is located is configured to conduct to the suction port 120 of the compressor 100.

[0053] In this case, the refrigeration heat exchanger 210 and the heating heat exchanger 230 operate simultaneously, while the heat balance heat exchanger 220 is in a non-operating state. Therefore, the stepless refrigeration and heating regulation system can provide both refrigerating capacity and heating capacity for users to meet the actual cooling and heating requirements. Specifically, since the interface b and the interface c of the first three-way valve 510 are mutually conductive, the interface b and the interface a of the second three-way valve 520 are mutually conductive, and the refrigeration expansion valve 310 is in an open state, which can play a role in throttling and reducing pressure, while the heating expansion valve 330 and the heat balance expansion valve 320 are in a closed state. Therefore, the second branch where the heat balance heat exchanger 220 is located is blocked (that is, in a closed state), and no refrigerant enters or exits.

[0054] Then, the compressed high-temperature and high-pressure gaseous refrigerant flows out from the exhaust port 110 of the compressor 100, and flows into the heating heat exchanger 230 through the interfaces a and b of the second three-way valve 520 to provide heat externally and meet the heating capacity requirement; after releasing heat, the refrigerant flowing out from the heating heat exchanger 230 flows through the second check valve 420 to the refrigeration expansion valve 310; then, after flowing through the refrigeration expansion valve 310, the refrigerant undergoes a temperature drop and a pressure drop, and flows into the refrigeration heat exchanger 210 to provide cold externally and meet the refrigeration capacity requirement; after absorbing heat and evaporating, the refrigerant flowing out from the refrigeration heat exchanger 210 flows back to the compressor 100 through the suction port 120 of the compressor 100, thus completing a cycle of refrigerant flow. During the process of simultaneous refrigeration and heating, by controlling the opening degree of the refrigeration expansion valve 310, the refrigeration capacity requirement of the system can be matched.

[0055] The stepless refrigeration and heating regulation system has a separate refrigeration mode. In the separate refrigeration mode, as Figure 3 shown, the refrigeration expansion valve 310 is configured to be in an open state, the two expansion valves are configured to be in a closed state, and moreover, the three-way valve located on the second branch where the heat balance heat exchanger 220 is located is configured to be conducted to the exhaust port 110 of the compressor 100, and the three-way valve located on the second branch where the heating heat exchanger 230 is located is configured to be conducted to the suction port 120 of the compressor 100.

[0056] In this case, the refrigeration heat exchanger 210 and the heat balance heat exchanger 220 operate simultaneously, while the heating heat exchanger 230 is in a non-operating state. Therefore, the stepless refrigeration and heating regulation system can provide refrigeration capacity for users to meet the refrigeration capacity requirement, and can also recover and utilize waste heat. Specifically, since the interface b and the interface a of the first three-way valve 510 are mutually conducted, the interface b and the interface c of the second three-way valve 520 are mutually conducted, and the refrigeration expansion valve 310 is in an open state, it can play the role of throttling and pressure reduction, while the heating expansion valve 330 and the heat balance expansion valve 320 are both in a closed state. Therefore, the second branch where the heating heat exchanger 230 is located is blocked (i.e., in a closed state), and no refrigerant flows in or out.

[0057] Then, the compressed refrigerant flows out through the exhaust port 110 of the compressor 100, and flows into the heat balance heat exchanger 220 through the interface a and the interface b of the first three-way valve 510, so as to transfer the waste heat to other heat exchange media, such as heating air or water, so as to realize waste heat recovery and utilization; after the heat loss is completed, the refrigerant flowing out of the heat balance heat exchanger 220 flows to the refrigeration expansion valve 310 through the first one-way valve 410; under the throttling effect of the refrigeration expansion valve 310, the temperature and pressure of the refrigerant decrease, and the refrigerant will flow into the refrigeration heat exchanger 210 to exchange heat with other media flowing through the refrigeration heat exchanger 210, realize the refrigeration function, and meet the user's refrigeration capacity requirements; after the refrigerant flows out of the refrigeration heat exchanger 210, it flows into the compressor 100 through the air intake port 120 of the compressor 100, thereby completing a refrigerant flow cycle. In the process of single refrigeration, the refrigeration expansion valve 310 will open the corresponding opening to provide sufficient cooling capacity.

[0058] The stepless cooling and heating regulation system has a separate heating mode. In the separate heating mode, if Figure 4 As shown, the refrigeration expansion valve 310 is configured to be in a closed state, and for the second branch where the heating heat exchanger 230 is located, the three-way valve is configured to be connected to the exhaust port 110 of the compressor 100, and the expansion valve is configured to be in a closed state; at the same time, for the second branch where the heat balance heat exchanger 220 is located, the three-way valve is configured to be connected to the intake port 120 of the compressor 100, and the expansion valve is configured to be in an open state.

[0059] In this case, the heating heat exchanger 230 and the heat balance heat exchanger 220 are running at the same time, while the cooling heat exchanger 210 is in a non-working state, so the stepless cooling and heating regulation system can provide heat for the user to meet the heating demand, and the waste cooling capacity can also be recycled. Specifically, since the interface b and the interface c of the first three-way valve 510 are connected to each other, the interface b and the interface a of the second three-way valve 520 are connected to each other, the heat balance expansion valve 320 is in an open state, which can play a throttling role, and the cooling expansion valve 310 and the heating expansion valve 330 are both in a closed state, so the branch formed by the cooling heat exchanger 210 and the cooling expansion valve 310 in series is cut off (that is, in a closed state), and no refrigerant enters or exits.

[0060] Then, the refrigerant flowing out of the exhaust port 110 of the compressor 100 will flow into the heating heat exchanger 230 through the interface a and interface b of the second three-way valve 520 to provide heat to the outside and meet the user's heating demand; after completing the heat release, the refrigerant flowing out of the heating heat exchanger 230 will flow in the direction of the heat balance expansion valve 320 through the second one-way valve 420; then, after passing through the heat balance expansion valve 320, the temperature and pressure of the refrigerant will decrease, and it will flow into the heat balance heat exchanger 220 to recycle the waste cold, such as cooling air or water; then, after absorbing heat in the heat balance heat exchanger 220, the refrigerant will flow out of the heat balance heat exchanger 220 and flow back to the compressor 100 through the interface b and interface c of the first three-way valve 510, thus completing a refrigerant flow cycle. In the process of heating alone, the heat balance expansion valve 320 will open the corresponding opening to play a good throttling and pressure reduction role.

[0061] The stepless cooling and heating regulation system has cooling as the main mode and heating as the auxiliary mode. In the cooling as the main mode and heating as the auxiliary mode, Figure 5 As shown, the refrigeration expansion valve 310 is configured to be in an open state, the two three-way valves are configured to be connected to the exhaust port 110 of the compressor 100, and the two expansion valves are configured to be in a closed state.

[0062] In this case, the cooling heat exchanger 210, the heating heat exchanger 230 and the heat balance heat exchanger 220 are operated simultaneously, so the stepless cooling and heating regulation system can provide the user with the main cooling function and the secondary heating function, and can recover and utilize the waste heat. Specifically, since the interface b and the interface a of the first three-way valve 510 are connected to each other, and the interface b and the interface a of the second three-way valve 520 are connected to each other, the cooling expansion valve 310 is in an open state and can play a throttling role, while the heating expansion valve 330 and the heat balance expansion valve 320 are in a closed state, so that the first branch and the two second branches have refrigerant flowing.

[0063] Then, the refrigerant flowing out of the exhaust port 110 of the compressor 100 will be split into two paths. One path of the refrigerant will flow into the heat balance heat exchanger 220 through the interfaces a and b of the first three-way valve 510 to transfer heat outward, such as preheating air or water, to realize the recovery and utilization of waste heat. At this time, the heat balance heat exchanger 220 is in the heat dissipation mode. Immediately afterwards, the refrigerant flowing out of the heat balance heat exchanger 220 will flow towards the first one-way valve 410. At the same time, the other path of the refrigerant will flow into the heating heat exchanger 230 through the interfaces a and b of the second three-way valve 520 to realize the heating function. Immediately afterwards, the refrigerant flowing out of the heating heat exchanger 230 will pass through the second one-way valve 420 and converge with the refrigerant flowing out of the first one-way valve 410, and together flow towards the refrigeration expansion valve 310. Under the throttling action of the refrigeration expansion valve 310, the refrigerant is throttled and depressurized and flows into the refrigeration heat exchanger 210 to transfer cold outward to realize the refrigeration function. Finally, the refrigerant flowing out of the refrigeration heat exchanger 210 will return to the compressor 100 to complete a cycle of refrigerant flow. During this process, by controlling the opening value of the refrigeration expansion valve 310, the refrigerant can provide the required refrigeration capacity after passing through the refrigeration expansion valve 310.

[0064] It can be understood that when the stepless refrigeration and heating regulation system operates in the simultaneous refrigeration and heating mode, if the refrigeration capacity demand remains unchanged and the heating capacity demand decreases relatively, the first three-way valve 510 can be switched so that the interface b of the first three-way valve 510 is communicated with the interface a, causing the high-temperature and high-pressure refrigerant flowing out of the compressor 100 to be split, and part of the refrigerant flows to the heat balance heat exchanger 220, reducing the refrigerant flow rate flowing into the heating heat exchanger 230, so as to meet the user's low heating capacity demand. At this time, the stepless refrigeration and heating regulation system switches from the simultaneous refrigeration and heating mode to the refrigeration-based and heating-assisted mode.

[0065] When the stepless refrigeration and heating regulation system operates in the refrigeration-based and heating-assisted mode, if the refrigeration capacity demand remains unchanged and the heating capacity demand increases relatively, the first three-way valve 510 can be switched so that the interface b of the first three-way valve 510 is communicated with the interface c. At the same time, the heat balance expansion valve 320 is switched to the closed state, so that the high-temperature and high-pressure refrigerant flowing out of the compressor 100 all flows towards the heating heat exchanger 230 in sequence, increasing the refrigerant flow rate flowing into the heating heat exchanger 230, so as to meet the user's high heating capacity demand. At this time, the stepless refrigeration and heating regulation system switches from the refrigeration-based and heating-assisted mode to the simultaneous refrigeration and heating mode.

[0066] The stepless refrigeration and heating regulation system has a heating-based and refrigeration-assisted mode. In the heating-based and refrigeration-assisted mode, as Figure 6As shown, the refrigeration expansion valve 310 is configured in an open state. For the second branch where the heating heat exchanger 230 is located, the three-way valve is configured to conduct to the exhaust port 110 of the compressor 100, and moreover, the expansion valve is configured in a closed state; meanwhile, for the second branch where the heat balance heat exchanger 220 is located, the three-way valve is configured to conduct to the suction port 120 of the compressor 100, and moreover, the expansion valve is configured in an open state.

[0067] In this case, the refrigeration heat exchanger 210, the heating heat exchanger 230, and the heat balance heat exchanger 220 operate simultaneously. Thus, the stepless refrigeration and heating regulation system can provide the user with the main heating function and the secondary refrigeration function, and moreover, can recover and utilize the waste cold. Specifically, since the interface b and the interface c of the first three-way valve 510 are mutually conductive, the interface b and the interface a of the second three-way valve 520 are mutually conductive, and both the refrigeration expansion valve 310 and the heat balance expansion valve 320 are in an open state and can both play a throttling role, while the heating expansion valve 330 is in a closed state. Therefore, the refrigerant flows through the first branch and the two second branches.

[0068] Then, the refrigerant flowing out of the compressor 100 will flow into the heating heat exchanger 230 through the interface a and the interface b of the second three-way valve 520, and perform heat exchange in the heating heat exchanger 230 to provide sufficient heat to meet the user's heating demand; then, after passing through the second check valve 420, the refrigerant flowing out of the heating heat exchanger 230 will be branched. Part of the refrigerant will flow to the refrigeration expansion valve 310. Under the throttling effect of the refrigeration expansion valve 310, the refrigerant undergoes a temperature drop and a pressure drop and flows into the refrigeration heat exchanger 210 to achieve the refrigeration function; another part of the refrigerant will flow to the heat balance expansion valve 320. Under the throttling effect of the heat balance expansion valve 320, the refrigerant will undergo a temperature drop and a pressure drop and flow into the heat balance heat exchanger 220 to transfer the cold outside, such as precooling air or water, to achieve the recovery of the wasted cold. At this time, the heat balance heat exchanger 220 is in an endothermic mode. The refrigerant flowing out of the heat balance heat exchanger 220 will converge with the refrigerant flowing out of the refrigeration heat exchanger 210 after passing through the interface b and the interface c of the first three-way valve 510, and then flow back to the compressor 100 together to complete a refrigerant flow cycle. During this process, by controlling the opening values of the refrigeration expansion valve 310 and the heat balance expansion valve 320, the refrigerant can provide the required refrigeration capacity after passing through the refrigeration expansion valve 310 and the heat balance expansion valve 320, so as to achieve the control of the refrigeration capacity and the cold dissipation capacity.

[0069] It can be understood that when the stepless cooling and heating regulation system operates in the simultaneous cooling and heating mode, if the heating demand remains unchanged and the cooling demand decreases relatively, the switching action of the first three-way valve 510 can be used to make the interface b of the first three-way valve 510 communicate with the interface c. At the same time, the heat balance expansion valve 320 is switched to the open state, so that the refrigerant flowing out of the second check valve 420 is split, and part of the refrigerant flows through the heat balance expansion valve 320 and the heat balance heat exchanger 220 in sequence, reducing the refrigerant flow rate flowing into the refrigeration heat exchanger 210, so as to meet the user's low cooling demand. At this time, the stepless cooling and heating regulation system switches from the simultaneous cooling and heating mode to the heating-dominated and cooling-assisted mode.

[0070] When the stepless cooling and heating regulation system operates in the heating-dominated and cooling-assisted mode, if the heating demand remains unchanged and the cooling demand increases relatively, the heat balance expansion valve 320 can be switched to the closed state, so that all the refrigerant flowing out of the second check valve 420 flows to the refrigeration heat exchanger 210, increasing the refrigerant flow rate flowing into the refrigeration heat exchanger 210, so as to meet the user's high cooling demand. At this time, the stepless cooling and heating regulation system switches from the heating-dominated and cooling-assisted mode to the simultaneous cooling and heating mode.

[0071] The stepless cooling and heating regulation system has a defrosting mode. In the defrosting mode, as Figure 7 shown, the refrigeration expansion valve 310 is configured to be in the closed state. For the second branch where the heat balance heat exchanger 220 is located, the three-way valve is configured to communicate with the exhaust port 110 of the compressor 100, and the expansion valve is configured to be in the closed state; for the second branch where the heating heat exchanger 230 is located, the three-way valve is configured to communicate with the suction port 120 of the compressor 100, and the expansion valve is configured to be in the open state.

[0072] In this case, the heating heat exchanger 230 and the heat balance heat exchanger 220 operate simultaneously, and the refrigeration heat exchanger 210 is in the closed state. Since in the single heating mode, the heating heat exchanger 230 is in the heat release mode and the heat balance heat exchanger 220 is in the heat absorption mode, if the heat balance heat exchanger 220 is set in an air-cooled manner, therefore, in winter, the surface of the heat balance heat exchanger 220 is prone to frosting; in order to realize the defrosting function, through the switching actions of the first three-way valve 510 and the second three-way valve 520 and the opening and closing control of the heat balance expansion valve 320 and the heating expansion valve 330, the stepless cooling and heating regulation system is switched from the single heating mode to the defrosting mode. At this time, the heat balance heat exchanger 220 can be used as a condenser to release heat outward, solving the frosting problem at the heat balance heat exchanger 220. At the same time, the heating heat exchanger 230 is used as a condenser; and the heat balance heat exchanger 220 is equipped with a fan 700, and the fan 700 can adjust the speed to keep the system stable.

[0073] Specifically, since the interface b and interface a of the first three-way valve 510 are in communication with each other, the interface b and interface c of the second three-way valve 520 are in communication with each other, and the heating expansion valve 330 is in an open state and can play a throttling role, while the refrigeration expansion valve 310 and the heat balance expansion valve 320 are both in a closed state. Therefore, the branch formed by the series connection of the refrigeration heat exchanger 210 and the refrigeration expansion valve 310 is blocked (i.e., in a closed state), and no refrigerant flows in or out.

[0074] Then, the refrigerant flowing out from the exhaust port 110 of the compressor 100 will flow into the heat balance heat exchanger 220 through the interface a and interface b of the first three-way valve 510 to transfer heat outward and complete the automatic defrosting operation. At this time, the heat balance heat exchanger 220 is in the heat dissipation and defrosting mode; the refrigerant flowing out from the heat balance heat exchanger 220 flows through the first one-way valve 410 to the heating expansion valve 330. Under the throttling action of the heating expansion valve 330, the temperature and pressure of the refrigerant will decrease; the refrigerant flowing out from the heating expansion valve 330 will flow through the heating heat exchanger 230 for endothermic evaporation and return to the compressor 100 through the interface b and interface c of the second three-way valve 520, thereby completing a refrigerant flow cycle. During this process, by controlling the opening value of the heating expansion valve 330, the refrigerant can meet the required refrigeration capacity of the system after passing through the heating expansion valve 330.

[0075] As Figures 1 to 7 shown, the stepless refrigeration and heating adjustment system according to Embodiment 2 of the present invention is different from Embodiment 1 in that: the stepless refrigeration and heating adjustment system of Embodiment 2 further includes a flow control valve 600.

[0076] Moreover, at least one second branch is serially connected with a flow control valve 600, and the flow control valve 600 is configured to be able to adjust the refrigerant flow rate flowing into the second branch. The flow control valve 600 can adjust the refrigerant flow rate flowing through it by controlling its own opening. In this embodiment, the flow control valve 600 is an electric ball valve. By adjusting the opening of the electric ball valve, the refrigerant flow rate can be controlled, and moreover, the electric ball valve can completely cut off the refrigerant in the closed state.

[0077] One interface of the three-way valve is connected to one end of the heat exchanger away from the expansion valve through a pipeline. One of the remaining two interfaces of the three-way valve is connected to the suction port 120 of the compressor 100 through a pipeline, and the other is connected to the flow control valve 600 and the exhaust port 110 of the compressor 100 in series through a pipeline.

[0078] It can be understood that in some examples, a flow control valve 600 is provided in the second branch where the heating heat exchanger 230 is located. The flow control valve 600 can be arranged between the second three-way valve 520 and the heating heat exchanger 230, or between the heating heat exchanger 230 and the heating expansion valve 330, or can also be arranged between the second three-way valve 520 and the exhaust port 110 of the compressor 100.

[0079] In this embodiment, as Figure 1 shown in FIGS. 5 to 7, the number of the flow control valves 600 is one. The flow control valve 600 is arranged on the second branch where the heating heat exchanger 230 is located. The interface a of the second three-way valve 520, the flow control valve 600 and the exhaust port 110 of the compressor 100 are sequentially connected through pipelines.

[0080] As Figure 2 shown, in the simultaneous refrigeration and heating mode, the flow control valve 600 is in the fully open state. As Figure 3 shown, in the single refrigeration mode, the flow control valve 600 can be in the fully closed state. As Figure 4 shown, in the single heating mode, the flow control valve 600 is in the fully open state. As Figure 5 shown, in the refrigeration-based and heating-assisted mode, the flow control valve 600 is in the open state and can adjust its own opening degree according to the heating capacity required by the heating heat exchanger 230, so as to control the flow ratio between the refrigerant flowing into the heating heat exchanger 230 and the refrigerant flowing into the heat balance heat exchanger 220. As Figure 6 shown, in the heating-based and refrigeration-assisted mode, the flow control valve 600 is in the fully open state.

[0081] In some other examples, a flow control valve 600 is provided in the second branch where the heat balance heat exchanger 220 is located. The flow control valve 600 can be arranged between the first three-way valve 510 and the heat balance heat exchanger 220, or between the heat balance heat exchanger 220 and the heat balance expansion valve 320, or can also be arranged between the first three-way valve 510 and the exhaust port 110 of the compressor 100.

[0082] It can be understood that in the case of arranging the flow control valve 600 between the first three-way valve 510 and the heat balance heat exchanger 220, or between the heat balance heat exchanger 220 and the heat balance expansion valve 320, when the stepless refrigeration and heating adjustment system is in the refrigeration-based and heating-assisted mode, by regulating the opening value of the flow control valve 600, the refrigerant flow rate flowing into the heating heat exchanger 230 can be adjusted to meet the heating capacity requirement; when the stepless refrigeration and heating adjustment system is in the heating-based and refrigeration-assisted mode, by regulating the opening value of the flow control valve 600, the refrigerant flow rate flowing into the refrigeration heat exchanger 210 can be adjusted to meet the refrigeration capacity requirement.

[0083] In still other examples, flow control valves 600 are provided in both of the second branch circuits.

[0084] The stepless refrigeration and heating regulation system provided by the second embodiment realizes multiple operating conditions such as simultaneous refrigeration and heating, independent refrigeration, independent heating, refrigeration-based and heating-assisted, heating-based and refrigeration-assisted, and defrosting through system optimization and function integration, and adopts a relatively simple pipeline design. Moreover, it can perform cold quantity recovery or heat quantity recovery. At the same time, the recovered cold quantity or heat quantity can be steplessly regulated. Finally, the stepless refrigeration and heating regulation system can operate under all conditions.

[0085] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0086] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A stepless cooling and heating regulation system, characterized in that: include: The first branch includes a compressor, a refrigeration heat exchanger and a refrigeration expansion valve connected in series in sequence; The second branch is provided with two, each of which comprises a one-way control element and a three-way valve, a heat exchanger and an expansion valve connected in series in sequence, the one-way control element is connected in parallel to the expansion valve, and the conducting direction of the one-way control element is from one end of the one-way control element close to the heat exchanger to the other end; Among them, the other two interfaces of each of the three-way valves are respectively connected to the suction port and the exhaust port of the compressor, and the interface of each of the three-way valves connected to the heat exchanger is switched to one of the other two interfaces. The end of each expansion valve away from the heat exchanger is connected to the end of the refrigeration expansion valve away from the refrigeration heat exchanger. The two heat exchangers are respectively a heating heat exchanger and a heat balance heat exchanger, and the expansion valve and the refrigeration expansion valve are electrically driven.

2. The stepless cooling and heating regulating system according to claim 1, characterized in that: At least one of the second branches is connected in series with a flow control valve, and the flow control valve is configured to adjust the flow of the refrigerant flowing into the second branch.

3. The stepless cooling and heating regulating system according to claim 2, characterized in that: One of the other two interfaces of the three-way valve is connected to the air intake port of the compressor, and the other is connected in series to the flow control valve and the air exhaust port of the compressor.

4. The stepless cooling and heating regulating system according to claim 1, characterized in that: The stepless cooling and heating regulation system has a simultaneous cooling and heating mode. In the simultaneous cooling and heating mode, the refrigeration expansion valve is configured to be in an open state, the two expansion valves are configured to be in a closed state, and the three-way valve located on the second branch where the heating heat exchanger is located is configured to be connected to the exhaust port of the compressor, and the three-way valve located on the second branch where the thermal balance heat exchanger is located is configured to be connected to the intake port of the compressor.

5. The stepless cooling and heating regulating system according to claim 1, characterized in that: The stepless cooling and heating regulation system has a separate cooling mode. In the separate cooling mode, the refrigeration expansion valve is configured to be in an open state, the two expansion valves are configured to be in a closed state, and the three-way valve located on the second branch where the thermal balance heat exchanger is located is configured to be connected to the exhaust port of the compressor, and the three-way valve located on the second branch where the heating heat exchanger is located is configured to be connected to the intake port of the compressor.

6. The stepless cooling and heating regulating system according to claim 1, characterized in that: The stepless cooling and heating regulation system has a separate heating mode. In the separate heating mode, the refrigeration expansion valve is configured to be in a closed state. For the second branch where the heating heat exchanger is located, the three-way valve is configured to be connected to the exhaust port of the compressor, and the expansion valve is configured to be in a closed state; for the second branch where the thermal balance heat exchanger is located, the three-way valve is configured to be connected to the intake port of the compressor, and the expansion valve is configured to be in an open state.

7. The stepless cooling and heating regulating system according to claim 1, characterized in that: The stepless cooling and heating regulation system has a cooling-main and heating-auxiliary mode. In the cooling-main and heating-auxiliary mode, the refrigeration expansion valve is configured to be in an open state, the two three-way valves are configured to be connected to the exhaust port of the compressor, and the two expansion valves are configured to be in a closed state.

8. The stepless cooling and heating regulating system according to claim 1, characterized in that: The stepless cooling and heating regulation system has a heating-main and cooling-auxiliary mode. In the heating-main and cooling-auxiliary modes, the cooling expansion valve is configured to be in an open state, and for the second branch where the heating heat exchanger is located, the three-way valve is configured to be connected to the exhaust port of the compressor, and the expansion valve is configured to be in a closed state; for the second branch where the thermal balance heat exchanger is located, the three-way valve is configured to be connected to the intake port of the compressor, and the expansion valve is configured to be in an open state.

9. The stepless cooling and heating regulating system according to claim 1, characterized in that: The stepless cooling and heating regulation system has a defrost mode. In the defrost mode, the refrigeration expansion valve is configured to be in a closed state. For the second branch where the thermal balance heat exchanger is located, the three-way valve is configured to be connected to the exhaust port of the compressor, and the expansion valve is configured to be in a closed state; for the second branch where the heating heat exchanger is located, the three-way valve is configured to be connected to the intake port of the compressor, and the expansion valve is configured to be in an open state.

10. The stepless cooling and heating regulating system according to claim 1, characterized in that: The one-way control component is a one-way valve.

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