Condensation heat recovery system with stepless temperature regulation function

Abstract

The invention discloses a condensation heat recovery system with a stepless temperature adjustment function, and relates to the technical field of condensation heat recovery. Two interfaces of the four-way valve are respectively communicated with an inlet and an outlet of the compressor; each refrigerant flow path comprises a heat exchanger, a one-way control part and a throttling part, the one-way control parts are connected with the throttling parts in parallel and are connected with one ends of the heat exchangers in series, the one ends, close to the heat exchangers, of the one-way control parts face the other ends, and the other ends of the two heat exchangers communicate with the other two connectors of the four-way valve correspondingly. The two heat exchangers are an evaporator and a condenser respectively; the two ends of the heat recovery heat exchanger communicate with the ends, away from the heat exchanger, of the two one-way control pieces. One end of the flow control valve communicates with the end, away from the heat exchanger, of the one-way control piece on one refrigerant flow path, and the other end of the flow control valve communicates with the other end of the heat exchanger on the same refrigerant flow path or an outlet of the compressor. According to the invention, pipelines can be simplified, the manufacturing cost is reduced, the recovery amount of condensation heat is adjusted, and stepless temperature adjustment is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of condensation heat recovery, and particularly to a stepless temperature-adjustable condensation heat recovery system. Background Art

[0002] At present, condensation heat recovery technology is mostly applied to heat pump systems installed in industrial and civil buildings to realize the recovery and utilization of compressor condensation waste heat, so as to significantly improve energy utilization efficiency and achieve the purposes of energy conservation, environmental protection and economy.

[0003] In common condensation heat recovery technologies, they can be divided into types such as three-pipe heat recovery devices and four-pipe heat recovery devices. However, the foregoing heat recovery devices have the following problems: the refrigerant pipeline resistance is large, and the heat recovery amount is difficult to control. Especially when the heat pump unit is designed as a split structure, the condensation heat recovery device is far from the compressor, resulting in a complex pipeline system of the system and high costs. Therefore, the existing condensation heat recovery systems need to be further optimized. Summary of the Invention

[0004] 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 temperature-adjustable condensation heat recovery system, which can simplify the pipeline, reduce the manufacturing cost, and adjust the condensation heat recovery amount while realizing condensation heat recovery, so as to achieve the purpose of stepless temperature adjustment.

[0005] An embodiment of the present invention provides a stepless temperature-adjustable condensation heat recovery system, which includes: A compressor; A four-way valve, two of whose interfaces are respectively connected to the inlet and outlet of the compressor; There are two refrigerant flow paths. Each refrigerant flow path includes a heat exchanger, a one-way control member and a throttling member. The one-way control member is connected in parallel with the throttling member and is connected in series with one end of the heat exchanger. The conduction direction of the one-way control member is from the end close to the heat exchanger towards the other end. The other ends of the two heat exchangers are respectively connected to the other two interfaces of the four-way valve; the two heat exchangers are an evaporator and a condenser respectively; A heat recovery heat exchanger, both ends of which are respectively connected to the ends of the two one-way control members far from the heat exchanger; A flow control valve, one end of which is connected to the end of the one-way control member on one of the refrigerant flow paths far from the heat exchanger, and the other end is connected to the other end of the heat exchanger on the same refrigerant flow path or the outlet of the compressor.

[0006] The condensing heat recovery system with stepless temperature regulation according to the embodiments of the present invention has at least the following beneficial effects: Through the switching action of the four-way valve, the condensing heat recovery system with stepless temperature regulation can be switched between the heating mode and the cooling mode; When the condensing heat recovery system with stepless temperature regulation is in the cooling mode, the heat exchanger on the indoor side serves as the evaporator, and the heat exchanger on the outdoor side serves as the condenser. By opening the flow control valve, a part of the high-pressure and high-temperature refrigerant flowing out of the outlet of the compressor can flow into the condenser and dissipate heat to the outside to become high-pressure and medium-temperature refrigerant, and the other part can flow to the flow control valve and converge with the high-pressure and medium-temperature refrigerant flowing out of the condenser, and then enter the heat recovery heat exchanger together. Then, the refrigerant can transfer its heat to the medium in the heat recovery heat exchanger to realize the recovery and utilization of condensing heat. At the same time, by adjusting the opening degree of the flow control valve, the flow rate of the refrigerant flowing into the condenser can be controlled, so as to adjust the heat recovery capacity of the heat recovery heat exchanger and achieve the purpose of stepless temperature regulation; Then, the refrigerant flowing out of the heat recovery heat exchanger will flow into the evaporator after throttling treatment to provide cooling capacity, and finally return to the inlet of the compressor.

[0007] Moreover, with the above structural design, the condensing heat recovery system with stepless temperature regulation can also simplify the pipeline of the system, reduce the number of components, and thus reduce the manufacturing cost of the system.

[0008] In some embodiments of the present invention, the condensing heat recovery system with stepless temperature regulation has a cooling mode, and the flow control valve is configured to be in an open state and can control the opening degree to adjust the flow rate of the refrigerant flowing into the heat recovery heat exchanger through the flow control valve.

[0009] In some embodiments of the present invention, the condensing heat recovery system with stepless temperature regulation has a heating mode, and the flow control valve is configured to be in a closed state.

[0010] In some embodiments of the present invention, the condensing heat recovery system with stepless temperature regulation further includes a three-way reversing valve. Both ends of the flow control valve are respectively communicated with the outlet of the compressor and the input port of the three-way reversing valve, and the two output ports of the three-way reversing valve are respectively communicated with both ends of the heat recovery heat exchanger.

[0011] In some embodiments of the present invention, the condensing heat recovery system with stepless temperature regulation has a cooling mode, the flow control valve is configured to be in an open state and can control the opening degree to adjust the flow rate of the refrigerant flowing to the three-way reversing valve, and the three-way reversing valve is configured to conduct one of the output ports so that the refrigerant passing through the three-way reversing valve flows into the heat recovery heat exchanger.

[0012] In some embodiments of the present invention, the stepless temperature-adjustable condensing heat recovery system has a heating mode. The flow control valve is configured to be in an open state and can control the opening degree to adjust the refrigerant flow rate flowing to the three-way reversing valve. The three-way reversing valve is configured to conduct the other output port so that the refrigerant passing through the three-way reversing valve flows into the heat recovery heat exchanger.

[0013] In some embodiments of the present invention, the throttling member is an expansion valve.

[0014] In some embodiments of the present invention, the flow control valve is an electric ball valve.

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

[0016] In some embodiments of the present invention, the heat recovery heat exchanger and the evaporator are arranged on the indoor side, and the compressor, the condenser, the four-way valve and the flow control valve are arranged on the outdoor side.

[0017] Other features and advantages of the present invention will be described in the following specification, and in part will be obvious from the specification, or will be understood by implementing the present invention. The objectives and other advantages of the present invention can be realized and obtained by the structures specifically pointed out in the specification, the claims and the drawings. Description of the Drawings

[0018] Figure 1 is a schematic structural diagram of the stepless temperature-adjustable condensing heat recovery system provided by Embodiment 1 of the present invention; Figure 2 is a schematic working principle diagram of the stepless temperature-adjustable condensing heat recovery system provided by Embodiment 1 of the present invention for condensing heat recovery in the refrigeration mode; Figure 3 is a schematic working principle diagram of the stepless temperature-adjustable condensing heat recovery system provided by Embodiment 1 of the present invention for condensing heat recovery in the heating mode; Figure 4 is a schematic structural diagram of the stepless temperature-adjustable condensing heat recovery system provided by Embodiment 2 of the present invention; Figure 5 is a schematic working principle diagram of the stepless temperature-adjustable condensing heat recovery system provided by Embodiment 2 of the present invention for condensing heat recovery in the refrigeration mode; Figure 6 is a schematic working principle diagram of the stepless temperature-adjustable condensing heat recovery system provided by Embodiment 2 of the present invention for condensing heat recovery in the heating mode; Figure 7 is a schematic structural diagram of the stepless temperature-adjustable condensing heat recovery system provided by Embodiment 3 of the present invention; Figure 8 It is a schematic diagram of the working principle of the condensing heat recovery system with stepless temperature adjustment provided in Embodiment 3 of the present invention for condensing heat recovery in the refrigeration mode; Figure 9 It is a working principle diagram of the condensing heat recovery system with stepless temperature adjustment provided in Embodiment 3 of the present invention for condensing heat recovery in the heating mode.

[0019] Reference numerals: 100, compressor; 110, outlet; 120, inlet; 200, four-way valve; 310, first heat exchanger; 320, second heat exchanger; 410, first check valve; 420, second check valve; 510, first throttling element; 520, second throttling element; 600, flow control valve; 700, heat recovery heat exchanger; 800, three-way reversing valve. Detailed implementation manners

[0020] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the 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 with reference to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation of the present invention.

[0021] 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 "plurality" is two or more.

[0022] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "connected" and "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. 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 situations.

[0023] The condensing heat recovery technology is a technology that improves the energy utilization efficiency by effectively recovering the heat released during the condensing process. Due to its advantages such as energy saving, environmental protection, and economy, it is widely used in many fields such as heating, ventilation, and air conditioning, industrial production, and hot water supply.

[0024] Currently, the condensing heat recovery technology is widely used in most regions of our country. For the constant temperature and humidity air conditioning equipment used in places such as hospitals, office buildings, libraries, hotels, laboratories, public transportation buildings, and production plants, the condensing heat recovery technology is usually adopted. In addition, the condensing heat recovery technology is also widely applied in environments with a demand for domestic hot water.

[0025] However, the condensation heat recovery technology faces challenges such as high initial investment, complex system integration design, and complex maintenance. Among common condensation heat recovery technologies, they can be divided into types such as three-pipe heat recovery devices and four-pipe heat recovery devices. However, the aforementioned heat recovery devices have the following problems: the resistance of the refrigerant pipeline is large, it is difficult to control the heat recovery amount, especially when the heat pump unit is designed as a split structure, the installation position of the heat recovery device is far from the compressor (the compressor is located outdoors and the heat recovery device is located indoors), resulting in complex pipelines and high costs for the system.

[0026] Based on this, the present invention provides a stepless temperature-adjusting condensation heat recovery system, which can simplify the pipeline of the system, reduce the manufacturing cost of the system, and arbitrarily adjust the recovered amount of condensation heat while realizing condensation heat recovery, so as to achieve precise temperature control through continuous and stepless adjustment and meet the occasions that require precise temperature control.

[0027] Next, refer to Figures 1 to 9 to describe the stepless temperature-adjusting condensation heat recovery system provided according to an embodiment of the present invention.

[0028] As Figures 1 to 3 shown, the stepless temperature-adjusting condensation heat recovery system according to Embodiment 1 of the present invention includes a compressor 100, a four-way valve 200, a refrigerant flow path, a heat recovery heat exchanger 700, and a flow control valve 600.

[0029] Among them, the compressor 100, as one of the core components, can compress the low-temperature and low-pressure gaseous refrigerant into a high-temperature and high-pressure state by doing work and can drive the refrigerant (i.e., the refrigerant) to circulate in the system, thereby realizing the transfer of heat. The compressor 100 has an inlet 120 and an outlet 110. The low-temperature and low-pressure gaseous refrigerant flows into the compressor 100 through the inlet 120, and the high-temperature and high-pressure gaseous refrigerant flows out of the compressor 100 through the outlet 110.

[0030] Two of the interfaces of the four-way valve 200 are respectively connected to the inlet 120 and the outlet 110 of the compressor 100 through pipelines. It can be understood that the four-way valve 200 has four interfaces, namely the first interface, the second interface, the third interface and the fourth interface. Among them, the first interface is connected to the outlet 110 of the compressor 100 through a pipeline, so that the high-temperature and high-pressure gaseous refrigerant flows into the four-way valve 200 from the outlet 110 of the compressor 100. The third interface is connected to the inlet 120 of the compressor 100 through a pipeline, so that the low-temperature and low-pressure gaseous refrigerant flows into the compressor 100 from the four-way valve 200. Through the switching action of the four-way valve 200, the first interface can be switched to conduct the second interface or the fourth interface. When the first interface is conducted with the second interface, the third interface is conducted with the fourth interface. When the first interface is conducted with the fourth interface, the second interface is conducted with the third interface. Therefore, the flow direction of the refrigerant can be changed, enabling the stepless temperature control condensing heat recovery system to realize the switching between the refrigeration function and the heating function.

[0031] There are two refrigerant flow paths. Moreover, the structure of each refrigerant flow path includes a heat exchanger, a one-way control component and a throttling component. Among them, the one-way control component and the throttling component are connected in parallel through a pipeline. And the one-way control component and one end of the heat exchanger are connected in series through a pipeline. The conducting direction of the one-way control component is from the end close to the heat exchanger towards the other end.

[0032] It can be understood that the cut-off direction of the one-way control component is from the end far away from the heat exchanger towards the other end. Therefore, the one-way control component has a refrigerant inlet 120 and a refrigerant outlet. The refrigerant inlet 120 is connected to one end of the heat exchanger and one end of the throttling component through a pipeline. The refrigerant outlet is connected to the other end of the throttling component through a pipeline. When the one-way control component is in the conducting state, the refrigerant first flows through the heat exchanger, and after heat exchange, it will flow through the one-way control component. At this time, the throttling component is in a non-working state, and the refrigerant does not flow into the throttling component, and the refrigerant fails to be throttled and depressurized. When the one-way control component is in the cut-off state, the refrigerant first flows through the throttling component, and after completing throttling and depressurization, it will flow into the heat exchanger for heat transfer. At this time, the refrigerant cannot flow through the one-way control component. Therefore, the function of the one-way control component in the refrigerant flow path is to control the switching of the throttling component between the working state and the non-working state, that is, to control whether the refrigerant is throttled and depressurized, so as to control whether the temperature and pressure state of the refrigerant change.

[0033] In this embodiment, the throttling element is an expansion valve, such as an electronic expansion valve or a thermostatic expansion valve. The one-way control element is a one-way valve. Of course, in other embodiments, the throttling element may be a capillary tube; the one-way control element is an electric control valve such as a ball valve. When the throttling element switches to the working state, the electric control valve is in the closed state. When the throttling element switches to the non-working state, the electric control valve is in the open state. At this time, the flow resistance of the branch where the electric control valve is located is much smaller than that of the branch where the throttling element is located. Therefore, the refrigerant flows to the branch where the electric control valve is located.

[0034] The other ends of the two heat exchangers are respectively connected to the other two interfaces of the four-way valve 200 through pipelines. In this embodiment, the second interface is connected to one end of one heat exchanger away from the throttling element through a pipeline, and the fourth interface is connected to one end of the other heat exchanger away from the throttling element through a pipeline. The two heat exchangers are an evaporator and a condenser respectively. One heat exchanger is installed in the indoor environment, and the other heat exchanger is installed in the outdoor environment, so as to realize heat transfer between the indoor and outdoor.

[0035] It can be understood that due to the switching control of the four-way valve 200, the stepless temperature control condensing heat recovery system can switch between the heating mode and the cooling mode. Therefore, each heat exchanger can be used as an evaporator and a condenser. Specifically, as Figures 1 to 3 shown, assume that the heat exchanger installed in the indoor environment is the first heat exchanger 310, and the heat exchanger installed in the outdoor environment is the second heat exchanger 320. When the stepless temperature control condensing heat recovery system is in the heating mode, the first heat exchanger 310 is used as a condenser. At this time, the second heat exchanger 320 is used as an evaporator. When the stepless temperature control condensing heat recovery system is in the cooling mode, the first heat exchanger 310 is used as an evaporator. At this time, the second heat exchanger 320 is used as a condenser.

[0036] In this embodiment, for one refrigerant flow path, the heat exchanger is the first heat exchanger 310, the throttling element is the first throttling element 510, and the one-way control element is the first one-way valve 410. For the other refrigerant flow path, the heat exchanger is the second heat exchanger 320, the throttling element is the second throttling element 520, and the one-way control element is the second one-way valve 420.

[0037] The opposite ends of the heat recovery heat exchanger 700 are respectively connected to the ends of the two one-way control elements away from the heat exchanger. That is to say, the heat recovery heat exchanger 700 is connected in series with the two refrigerant flow paths. It can be understood that the function of the heat recovery heat exchanger 700 is to recover the condensing heat and use the condensing heat to heat other media. For example, the recovered condensing heat can be used to heat the low-temperature air of the air-conditioning unit, or to heat the medium for heat recovery.

[0038] One end of the flow control valve 600 communicates with the end of the one-way control member on one of the refrigerant flow paths that is away from the heat exchanger, and the other end of the flow control valve 600 communicates with the other end of the heat exchanger on the same refrigerant flow path. That is, the opposite ends of the flow control valve 600 are respectively communicated with the opposite ends of one of the refrigerant flow paths through pipelines, so that the flow control valve 600 is connected in parallel with the refrigerant flow path.

[0039] In this embodiment, the flow control valve 600 is an electric ball valve. The port e of the heat recovery heat exchanger 700 is communicated with the refrigerant outlet of the second one-way valve 420 and one end of the flow control valve 600 through a pipeline. The port f of the heat recovery heat exchanger 700 is communicated with the refrigerant outlet of the first one-way valve 410 through a pipeline. The second interface of the four-way valve 200 is interface a, and the fourth interface of the four-way valve 200 is interface b. Interface a is communicated with the other end of the flow control valve 600 and the end of the second heat exchanger 320 away from the second one-way valve 420 through a pipeline. Interface b is communicated with the end of the first heat exchanger 310 away from the first one-way valve 410 through a pipeline. The compressor 100, the four-way valve 200, the flow control valve 600, the heat recovery heat exchanger 700 and the two refrigerant flow paths are connected by the above pipelines, thereby jointly forming a refrigerant circulation loop.

[0040] It can be understood that the heat exchanger on the refrigerant flow path connected in parallel with the flow control valve 600 is the second heat exchanger 320 and is arranged on the outdoor side, while the heat exchanger on the refrigerant flow path connected in series with the flow control valve 600 and the heat recovery heat exchanger 700 is the first heat exchanger 310 and is arranged on the indoor side. The function of the flow control valve 600 is to control the refrigerant flow rate flowing into the flow control valve 600 through its own opening adjustment, and further control the refrigerant temperature and pressure entering the heat recovery heat exchanger 700, so as to realize the adjustment of the condensation heat recovery amount of the heat recovery heat exchanger 700.

[0041] It can be understood that the heat exchanger and the heat recovery heat exchanger 700 can be finned heat exchangers, shell-and-tube heat exchangers, or double-pipe heat exchangers, etc., which are heat exchange devices that can meet the heat exchange between the refrigerant and other media such as water, air or oil. Components such as the compressor 100, the heat exchanger, the four-way valve 200, the throttling member, the one-way control member, the flow control valve 600 and the heat recovery heat exchanger 700 can be arranged in the same device, or can be respectively arranged in different devices and connected by pipelines.

[0042] In this embodiment, the first heat exchanger 310 is set as an evaporator, the second heat exchanger 320 is set as a condenser, and moreover, the heat recovery heat exchanger 700 and the evaporator are arranged on the indoor side, and at the same time, the compressor 100, the condenser, the four-way valve 200 and the flow control valve 600 are arranged on the outdoor side.

[0043] It can be understood that with such a setting method, the stepless temperature control condensing heat recovery system can be designed as a split structure. Only two pipes need to be set between the outdoor side and the indoor side (the pipe connected to the port e of the heat recovery heat exchanger 700 and the pipe connected between the interface b of the first heat exchanger 310 and the four-way valve 200), that is, a suction pipe and a liquid supply pipe, so that the stepless temperature control condensing heat recovery system becomes a two-pipe heat recovery device, simplifies the pipeline design of the system, reduces the number of components, is convenient for installation and maintenance, and can reduce the manufacturing cost of the system. The compressor 100 is arranged on the outdoor side, which can avoid the noise generated by the compressor 100 during operation from having an adverse impact on the indoor environment.

[0044] When the stepless temperature control condensing heat recovery system is in the refrigeration mode, the refrigerant in the first heat exchanger 310 can provide cooling capacity to cool and dehumidify the air in the indoor environment, and the refrigerant in the heat recovery heat exchanger 700 can provide condensing heat to heat the cooled and dehumidified air, or heat other media such as domestic water. When the stepless temperature control condensing heat recovery system is in the heating mode, the refrigerant in the first heat exchanger 310 can provide heat to heat and raise the temperature of the indoor air, and the refrigerant in the heat recovery heat exchanger 700 can provide heat to heat other heat exchange media such as domestic water, or heat the low-temperature air of the air conditioner unit.

[0045] In this embodiment, the stepless temperature control condensing heat recovery system has a refrigeration mode and a heating mode. Through the switching action of the four-way valve 200, the stepless temperature control condensing heat recovery system can be switched between the heating mode and the refrigeration mode.

[0046] When the stepless temperature control condensing heat recovery system is in the refrigeration mode, the flow control valve 600 is configured to be in an open state and can control its own opening degree to precisely adjust the refrigerant flow rate flowing into the heat recovery heat exchanger 700 through the flow control valve 600.

[0047] Specifically, as Figure 2 shown, when the stepless temperature control condensing heat recovery system operates in the refrigeration mode, the interface a of the four-way valve 200 is conducted to the first interface, the interface b of the four-way valve 200 is conducted to the third interface, the first one-way valve 410 and the second throttling member 520 are in a non-working state, the compressor 100, the second one-way valve 420, the first throttling member 510 and the flow control valve 600 are all in a working state, the first heat exchanger 310 serves as an evaporator, and the second heat exchanger 320 serves as a condenser.

[0048] Then, the high-temperature and high-pressure refrigerant is discharged from the outlet 110 of the compressor 100 and flows to the first interface of the four-way valve 200; the refrigerant flowing out from the interface a of the four-way valve 200 will be divided into two paths, one of which passes through the flow control valve 600, and the other flows into the second heat exchanger 320; the high-temperature and high-pressure refrigerant in the second heat exchanger 320 becomes a high-pressure and medium-temperature refrigerant after completing the heat transfer to the outside, and then, the high-pressure and medium-temperature refrigerant passes through the second one-way valve 420, and merges with the high-pressure and high-temperature refrigerant flowing through the flow control valve 600, and flows into the heat recovery heat exchanger 700 together.

[0049] The heat carried by the refrigerant in the heat recovery heat exchanger 700 can be absorbed by the medium flowing through the heat recovery heat exchanger 700, prompting the refrigerant to become a high-pressure and medium-temperature refrigerant, and at the same time, realizing the effective recovery and utilization of condensation heat; then, the high-pressure and medium-temperature refrigerant is converted into a low-temperature and low-pressure refrigerant under the throttling action of the first throttling member 510, and flows into the first heat exchanger 310 to absorb heat and evaporate, thereby being converted into a low-temperature and low-pressure gas; finally, the refrigerant after absorbing heat will flow to the interface b of the four-way valve 200, and flow back to the inlet 120 of the compressor 100, thereby completing a refrigerant flow cycle.

[0050] When the steplessly temperature-controlled condensing heat recovery system is operating in cooling mode, the opening of the flow control valve 600 can be steplessly adjusted to adjust the refrigerant flow ratio to the second heat exchanger 320 and the refrigerant flow to the flow control valve 600, thereby controlling the temperature and pressure of the refrigerant flowing into the heat recovery heat exchanger 700, thereby achieving precise control of the heat recovery amount of the heat recovery heat exchanger 700 and achieving the purpose of stepless temperature control.

[0051] When the stepless thermostatic condensing heat recovery system is in the heating mode, the flow control valve 600 is configured to be in a closed state.

[0052] Specifically, if Figure 3 As shown, when the stepless temperature control condensing heat recovery system operates in heating mode, interface a of the four-way valve 200 is connected to the third interface, interface b of the four-way valve 200 is connected to the first interface, the second one-way valve 420, the first throttling device 510 and the flow control valve 600 are in a non-working state, the compressor 100, the first one-way valve 410 and the second throttling device 520 are all in a working state, the first heat exchanger 310 acts as a condenser, and the second heat exchanger 320 acts as an evaporator.

[0053] Then, the refrigerant at high temperature and high pressure flows out from the outlet 110 of the compressor 100 and flows towards the first interface of the four-way valve 200; the refrigerant flowing out from the interface b of the four-way valve 200 will directly flow into the first heat exchanger 310, and after heating the indoor air, it becomes a refrigerant at high pressure and medium temperature, and then flows into the heat recovery heat exchanger 700 through the first check valve 410; in the heat recovery heat exchanger 700, the refrigerant at high pressure and medium temperature will transfer heat with the medium flowing through the heat recovery heat exchanger 700, so that the temperature of the refrigerant further decreases, thus realizing the recovery and utilization of the condensation heat.

[0054] Next, the refrigerant flowing out from the heat recovery heat exchanger 700 will be throttled and depressurized after flowing through the second throttling member 520, and thus becomes a refrigerant at low temperature and low pressure; the refrigerant at low temperature and low pressure will absorb heat during the process of flowing through the second heat exchanger 320 and becomes a gas at low temperature and low pressure; finally, the refrigerant after absorbing heat and evaporating will flow towards the interface a of the four-way valve 200 and return to the inlet 120 of the compressor 100, thus completing a cycle of refrigerant flow.

[0055] It can be understood that the stepless temperature-adjustable condensation heat recovery system provided in the first embodiment can realize the recovery and utilization of condensation heat in both the refrigeration mode and the heating mode, and moreover, the recovery amount of the condensation heat can be arbitrarily adjusted by means of the flow control valve 600 in the refrigeration mode. The recovered condensation heat can be used to heat the low-temperature air of the air-conditioning unit, or can be used to heat the medium for heat recovery, and moreover, the recovery amount of the condensation heat is adjustable.

[0056] As Figures 4 to 6 shown, the stepless temperature-adjustable condensation heat recovery system according to the second embodiment of the present invention has the same components as the first embodiment, and the difference between the second embodiment and the first embodiment lies in: the connection mode of the flow control valve 600 is different.

[0057] In the first embodiment, the flow control valve 600 is connected in parallel with one of the refrigerant flow paths. However, in the second embodiment, one end of the flow control valve 600 is communicated with the end of the one-way control member on one of the refrigerant flow paths far away from the heat exchanger, and the other end of the flow control valve 600 is communicated with the outlet 110 of the compressor 100.

[0058] In this embodiment, one end of the flow control valve 600 is communicated with the outlet 110 of the compressor 100 through a pipeline, and the other end of the flow control valve 600 is communicated with the refrigerant outlet of the second check valve 420 through a pipeline.

[0059] The second embodiment has the same technical effects as the first embodiment, which will not be elaborated here. As Figure 3 and Figure 6 shown, the operation processes of the first embodiment and the second embodiment in the heating mode are the same, which will not be elaborated here. As Figure 2 and Figure 5As shown, the operation processes of the first embodiment and the second embodiment in the refrigeration mode are basically the same. The only difference is whether the refrigerant flowing out of the outlet 110 of the compressor 100 is branched before or after flowing into the four-way valve 200.

[0060] Specifically, compared with the first embodiment, when the stepless temperature-adjustable condensing heat recovery system provided in the second embodiment operates in the refrigeration mode, the high-temperature and high-pressure refrigerant flowing out of the outlet 110 of the compressor 100 will first be divided into two paths. One path of the refrigerant will flow through the flow control valve 600, and the other path of the refrigerant will flow into the four-way valve 200 through the first interface of the four-way valve 200 and flow to the second heat exchanger 320 through the interface a of the four-way valve 200.

[0061] As Figures 7 to 9 shown, the difference between the stepless temperature-adjustable condensing heat recovery system according to the third embodiment of the present invention and the second embodiment is that: the stepless temperature-adjustable condensing heat recovery system of the third embodiment further includes a three-way reversing valve 800.

[0062] Moreover, both ends of the flow control valve 600 are respectively communicated with the outlet 110 of the compressor 100 and the input port of the three-way reversing valve 800, and the two output ports of the three-way reversing valve 800 are respectively communicated with both ends of the heat recovery heat exchanger 700.

[0063] In this embodiment, the three-way reversing valve 800 has one input port and two output ports, and the two output ports are respectively the interface c and the interface d. One end of the flow control valve 600 is communicated with the outlet 110 of the compressor 100 through a pipeline, the other end of the flow control valve 600 is communicated with the input port of the three-way reversing valve 800 through a pipeline, the interface c of the three-way reversing valve 800 is communicated with the port e of the heat recovery heat exchanger 700 and the refrigerant outlet of the second check valve 420 through a pipeline, and the interface d of the three-way reversing valve 800 is communicated with the port f of the heat recovery heat exchanger 700 and the refrigerant outlet of the first check valve 410 through a pipeline.

[0064] It can be understood that the three-way reversing valve 800 is an electric valve. Through the switching action of the three-way reversing valve 800, the input port is made to communicate with the interface c or the interface d, so as to be able to control the flow direction of the refrigerant flowing out of the flow control valve 600.

[0065] The stepless temperature-adjustable condensing heat recovery system provided in the third embodiment has a refrigeration mode and a heating mode. By controlling the action of the four-way valve 200, the stepless temperature-adjustable condensing heat recovery system is made to select between the heating mode and the refrigeration mode.

[0066] When the stepless temperature control condensing heat recovery system is in the refrigeration mode, the flow control valve 600 is configured to be in an open state and can control its own opening degree to precisely adjust the refrigerant flow rate flowing into the three-way reversing valve 800. At the same time, the three-way reversing valve 800 is configured to conduct one of its output ports, so that the refrigerant passing through the three-way reversing valve 800 flows into the heat recovery heat exchanger 700.

[0067] Specifically, as Figure 8 shown, when the stepless temperature control condensing heat recovery system operates in the refrigeration mode, the interface a of the four-way valve 200 is connected to the first interface, the interface b of the four-way valve 200 is connected to the third interface, the interface c of the three-way reversing valve 800 is connected to the input port, the interface d of the three-way reversing valve 800 is in a closed state, the first check valve 410 and the second throttle member 520 are in a non-operating state, the compressor 100, the second check valve 420, the first throttle member 510, and the flow control valve 600 are all in an operating state, the first heat exchanger 310 serves as an evaporator, and the second heat exchanger 320 serves as a condenser.

[0068] Then, the high-temperature and high-pressure refrigerant is discharged from the outlet 110 of the compressor 100 and is divided into two paths. One path of the refrigerant will flow to the flow control valve 600, and the other path of the refrigerant will flow to the first interface of the four-way valve 200; the refrigerant flowing out from the interface a of the four-way valve 200 will flow into the second heat exchanger 320, and after heat dissipation, it will become a high-pressure and medium-temperature refrigerant, and then pass through the second check valve 420; at the same time, the refrigerant flowing out from the flow control valve 600 will flow into the three-way reversing valve 800 and flow out from the interface c of the three-way reversing valve 800, and then, it will merge with the high-pressure and medium-temperature refrigerant flowing out from the second check valve 420 and flow into the heat recovery heat exchanger 700 together.

[0069] The self-heat of the refrigerant in the heat recovery heat exchanger 700 will be absorbed by the medium flowing through the heat recovery heat exchanger 700, which causes the temperature of the refrigerant to drop, making the refrigerant become a high-pressure and medium-temperature refrigerant. At the same time, the effective recovery and utilization of the condensing heat are realized. Then, the high-pressure and medium-temperature refrigerant becomes a low-temperature and low-pressure refrigerant under the throttling and pressure-reducing action of the first throttle member 510 and flows into the first heat exchanger 310. The refrigerant in the first heat exchanger 310 will absorb heat and evaporate, thus turning into a low-temperature and low-pressure gas; finally, the refrigerant after absorbing heat will return to the inlet 120 of the compressor 100 through the interface b and the third interface of the four-way valve 200 to complete a cycle of refrigerant flow.

[0070] During the operation of the condensing heat recovery system with stepless temperature regulation in the refrigeration mode, the opening degree of the flow control valve 600 can be adjusted steplessly to regulate the refrigerant flow ratio flowing to the second heat exchanger 320 and the flow control valve 600, thereby controlling the temperature and pressure of the refrigerant flowing into the heat recovery heat exchanger 700, achieving precise control of the heat recovery amount of the heat recovery heat exchanger 700, and achieving the purpose of stepless temperature regulation.

[0071] When the condensing heat recovery system with stepless temperature regulation is in the heating mode, the flow control valve 600 is configured to be in an open state and can control its own opening degree to precisely regulate the refrigerant flow flowing to the three-way reversing valve 800. At the same time, the three-way reversing valve 800 is configured to conduct another outlet so that the refrigerant passing through the three-way reversing valve 800 flows into the heat recovery heat exchanger 700.

[0072] Specifically, as Figure 9 shown, when the condensing heat recovery system with stepless temperature regulation is in the heating mode, the interface a of the four-way valve 200 is conducted to the third interface, the interface b of the four-way valve 200 is conducted to the first interface, the interface d of the three-way reversing valve 800 is conducted to the input port, the interface c of the three-way reversing valve 800 is in a closed state, the second check valve 420 and the first throttling element 510 are in a non-working state, the compressor 100, the first check valve 410, the second throttling element 520 and the flow control valve 600 are all in a working state, the first heat exchanger 310 serves as a condenser, and the second heat exchanger 320 serves as an evaporator.

[0073] Then, the high-temperature and high-pressure refrigerant flowing out of the outlet 110 of the compressor 100 will be divided into two paths. One path of the refrigerant will flow into the flow control valve 600, and the other path of the refrigerant will flow to the first interface of the four-way valve 200; the refrigerant flowing out of the interface b of the four-way valve 200 will directly flow into the first heat exchanger 310, and after heating the indoor air, it will become a high-pressure and medium-temperature refrigerant and flow out through the first check valve 410; at the same time, the refrigerant flowing out of the flow control valve 600 will flow into the three-way reversing valve 800 and flow out through the interface d of the three-way reversing valve 800, and then, it will be combined with the high-pressure and medium-temperature refrigerant flowing out of the first check valve 410 and flow into the heat recovery heat exchanger 700 together.

[0074] The refrigerant flowing through the heat recovery heat exchanger 700 will transfer heat to the medium flowing through the heat recovery heat exchanger 700, causing the temperature of the refrigerant to drop, turning the refrigerant into a high-pressure medium-temperature refrigerant, thereby achieving the effective recovery and utilization of the condensation heat. Then, the refrigerant flowing out of the heat recovery heat exchanger 700 will be throttled and depressurized after flowing through the second throttling member 520, thus becoming a low-temperature and low-pressure refrigerant; subsequently, the low-temperature and low-pressure refrigerant will absorb heat and evaporate during the process of flowing through the second heat exchanger 320, thus becoming a low-temperature and low-pressure gas; finally, the refrigerant after absorbing heat and evaporating will flow into the four-way valve 200 through the interface a of the four-way valve 200 and return to the inlet 120 of the compressor 100 through the third interface of the four-way valve 200, thus completing one cycle of refrigerant flow.

[0075] During the period when the condensation heat recovery system with stepless temperature regulation operates in the heating mode, by continuously regulating the opening degree of the flow control valve 600, the flow rate ratio of the refrigerant flowing to the first heat exchanger 310 and the refrigerant flowing to the flow control valve 600 is adjusted, thereby controlling the temperature and pressure of the refrigerant flowing into the heat recovery heat exchanger 700, achieving precise control of the heat recovery amount of the heat recovery heat exchanger 700, and finally achieving the purpose of stepless temperature regulation.

[0076] It can be understood that the condensation heat recovery system with stepless temperature regulation provided in the third embodiment can achieve the condensation heat recovery and utilization under the dual working conditions of the refrigeration mode and the heating mode. At the same time, the recovery amount of the condensation heat can be arbitrarily adjusted through the flow control valve 600. Moreover, the pipeline of the system is simplified and the number of components is reduced, which promotes the reduction of the manufacturing cost of the system, making the condensation heat recovery system with stepless temperature regulation have the advantage of high cost performance.

[0077] The recovered condensation heat can be used to heat and raise the temperature of the low-temperature air of the air-conditioning unit, or can be used to heat the medium for heat recovery. Moreover, the recovery amount of the condensation heat is adjustable.

[0078] 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.

[0079] 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 purposes of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A stepless temperature control condensation heat recovery system, characterized in that: include: compressor; A four-way valve, two ports of which are respectively connected to the inlet and outlet of the compressor; There are two refrigerant flow paths, each of which includes a heat exchanger, a one-way control element and a throttling element. The one-way control element is connected in parallel with the throttling element and is connected in series with one end of the heat exchanger. The conduction 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. The other ends of the two heat exchangers are respectively connected to the other two interfaces of the four-way valve; the two heat exchangers are respectively an evaporator and a condenser; A heat recovery heat exchanger, both ends of which are respectively connected to ends of the two one-way control members away from the heat exchanger; A flow control valve, one end of which is connected to an end of the one-way control member on one of the refrigerant flow paths away from the heat exchanger, and the other end of which is connected to the other end of the heat exchanger on the same refrigerant flow path or the outlet of the compressor.

2. The stepless temperature control condensation heat recovery system according to claim 1 is characterized in that: The steplessly thermostatic condensing heat recovery system has a cooling mode, and the flow control valve is configured to be in an open state and can control the opening size to adjust the flow of refrigerant flowing into the heat recovery heat exchanger through the flow control valve.

3. The stepless temperature control condensation heat recovery system according to claim 2 is characterized in that: The stepless temperature control condensation heat recovery system has a heating mode, and the flow control valve is configured to be in a closed state.

4. The stepless temperature control condensation heat recovery system according to claim 1, characterized in that: It also includes a three-way reversing valve, wherein the two ends of the flow control valve are respectively connected to the outlet of the compressor and the input port of the three-way reversing valve, and the two output ports of the three-way reversing valve are respectively connected to the two ends of the heat recovery heat exchanger.

5. The stepless temperature control condensation heat recovery system according to claim 4 is characterized in that: The steplessly thermostatic condensing heat recovery system has a cooling mode. The flow control valve is configured to be in an open state and can control the opening size to adjust the refrigerant flow to the three-way reversing valve. The three-way reversing valve is configured to open one of the output ports so that the refrigerant passing through the three-way reversing valve flows into the heat recovery heat exchanger.

6. The stepless temperature control condensation heat recovery system according to claim 5, characterized in that: The steplessly thermostatic condensing heat recovery system has a heating mode, the flow control valve is configured to be in an open state, and the opening size can be controlled to adjust the refrigerant flow to the three-way reversing valve, and the three-way reversing valve is configured to open the other output port so that the refrigerant passing through the three-way reversing valve flows into the heat recovery heat exchanger.

7. The stepless temperature control condensation heat recovery system according to claim 1, characterized in that: The throttling element is an expansion valve.

8. The stepless temperature control condensation heat recovery system according to claim 1, characterized in that: The flow control valve is an electric ball valve.

9. The stepless temperature control condensation heat recovery system according to claim 1, characterized in that: The one-way control component is a one-way valve.

10. The stepless temperature control condensation heat recovery system according to claim 1, characterized in that: The heat recovery heat exchanger and the evaporator are arranged on the indoor side, and the compressor, the condenser, the four-way valve and the flow control valve are arranged on the outdoor side.

Images