Condensation heat recovery system with stepless temperature regulation function

Abstract

The utility model discloses a condensation heat recovery system with a stepless temperature regulation 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 utility model, 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 utility model relates to condensing heat recovery technical field, especially in a kind of condensing heat recovery system of stepless temperature adjustment. BACKGROUND

[0002] At present, condensing heat recovery technology is mostly applied to heat pump system installed in industrial building and civil building, for realizing the recovery and utilization of compressor condensing waste heat, to significantly improve energy utilization, achieve the purpose of energy saving, environmental protection and economy.

[0003] In common condensing heat recovery technology, it can be divided into three-pipe heat recovery device, four-pipe heat recovery device and other types, but the aforementioned heat recovery device has the following problems: refrigerant pipeline resistance is large, heat recovery amount is difficult to control, especially when heat pump unit is designed as split structure, condensing heat recovery device is far away from compressor, leading to complex system pipeline, high cost. Therefore, the existing condensing heat recovery system needs to be further optimized. SUMMARY

[0004] The utility model aims at at least one of the technical problems existing in prior art. To this end, the utility model provides a kind of condensing heat recovery system of stepless temperature adjustment, while realizing condensing heat recovery, can simplify pipeline, reduce manufacturing cost, and adjust the recovery amount of condensing heat, reach the purpose of stepless temperature adjustment.

[0005] The utility model embodiment provides a kind of condensing heat recovery system of stepless temperature adjustment, it includes:

[0006] Compressor;

[0007] Four-way valve, two interfaces thereof are communicated with the inlet and outlet of the compressor respectively;

[0008] Refrigerant flow path, it is equipped with two, each refrigerant flow path includes heat exchanger, one-way control member and 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 that one end of the one-way control member close to the heat exchanger is towards another end, two other ends of the heat exchanger are communicated with other two interfaces of the four-way valve respectively;

[0009] Heat recovery heat exchanger, two ends thereof are communicated with one end of two one-way control members away from the heat exchanger respectively;

[0010] Flow control valve, one end thereof is communicated with one end of the one-way control member on one refrigerant flow path away from the heat exchanger, and the other end is communicated with other end of the heat exchanger on the same refrigerant flow path or the outlet of the compressor.

[0011] The condensing heat recovery system with stepless temperature adjustment has the following beneficial effects: the switching action of the four-way valve enables the condensing heat recovery system with stepless temperature adjustment to switch between the heating mode and the cooling mode; when the condensing heat recovery system with stepless temperature adjustment is in the cooling mode, the heat exchanger located on the indoor side serves as an evaporator, and the heat exchanger located on the outdoor side serves as a condenser; the opening of the flow control valve enables a part of the high-pressure high-temperature refrigerant flowing out of the outlet of the compressor to flow into the condenser and become high-pressure medium-temperature refrigerant by radiating heat to the outside, and another part of the high-pressure high-temperature refrigerant flows to the flow control valve and is combined with the high-pressure medium-temperature refrigerant flowing out of the condenser, and then enters the heat recovery heat exchanger; then, the refrigerant can transfer heat to the medium in the heat recovery heat exchanger, realize the recycling of condensing heat, and adjust the heat recovery capacity of the heat recovery heat exchanger by adjusting the opening of the flow control valve, so that the purpose of stepless temperature adjustment is achieved; then, the refrigerant flowing out of the heat recovery heat exchanger flows into the evaporator after throttling treatment to provide a refrigerating capacity, and finally flows back to the inlet of the compressor.

[0012] Moreover, the condensing heat recovery system with stepless temperature adjustment adopts the above structure design, can simplify the pipeline of the system, reduce the number of parts, and thus reduce the manufacturing cost of the system.

[0013] In some embodiments of the utility model, the condensing heat recovery system with stepless temperature adjustment has a cooling mode, the flow control valve is configured in an open state, and the opening size can be controlled to adjust the refrigerant flow rate flowing into the heat recovery heat exchanger through the flow control valve.

[0014] In some embodiments of the utility model, the condensing heat recovery system with stepless temperature adjustment has a heating mode, and the flow control valve is configured in a closed state.

[0015] In some embodiments of the utility model, the condensing heat recovery system with stepless temperature adjustment further comprises a three-way reversing valve, two 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 two output ports of the three-way reversing valve are respectively communicated with two ends of the heat recovery heat exchanger.

[0016] In some embodiments of the utility model, the condensing heat recovery system with stepless temperature adjustment has a cooling mode, the flow control valve is configured in an open state, and the opening size can be controlled to adjust the refrigerant flow rate flowing into the heat recovery heat exchanger through the flow control valve.

[0017] In some embodiments of the utility model, the condensing heat recovery system with infinitely variable temperature has heating mode, the flow control valve is configured to open state, and can control the size of opening degree, to adjust the refrigerant flow to the three -way reversing valve, the three -way reversing valve is configured to lead to another the output port, to make the refrigerant of three -way reversing valve flow into the heat recovery heat exchanger.

[0018] In some embodiments of the utility model, the throttling element is an expansion valve.

[0019] In some embodiments of the utility model, the flow control valve is an electric ball valve.

[0020] In some embodiments of the utility model, the one-way control element is a check valve.

[0021] In some embodiments of the utility model, 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.

[0022] Other features and advantages of the utility model will be set forth in the subsequent description, and, partially, become obvious from the description, or be understood by implementing the utility model. The purpose and other advantages of the utility model can be realized and obtained by the structure specially pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is the structure schematic diagram of the condensing heat recovery system with infinitely variable temperature provided according to the utility model embodiment one;

[0024] Figure 2 It is the working principle schematic diagram of the condensing heat recovery of the condensing heat recovery system with infinitely variable temperature provided according to the utility model embodiment one under refrigeration mode;

[0025] Figure 3 It is the working principle schematic diagram of the condensing heat recovery of the condensing heat recovery system with infinitely variable temperature provided according to the utility model embodiment one under heating mode;

[0026] Figure 4 It is the structure schematic diagram of the condensing heat recovery system with infinitely variable temperature provided according to the utility model embodiment two;

[0027] Figure 5 It is the working principle schematic diagram of the condensing heat recovery of the condensing heat recovery system with infinitely variable temperature provided according to the utility model embodiment two under refrigeration mode;

[0028] Figure 6is a working principle schematic diagram of the condensing heat recovery system in the heating mode according to the second embodiment of the utility model;

[0029] Figure 7 is a structure schematic diagram of the condensing heat recovery system according to the third embodiment of the utility model;

[0030] Figure 8 is a working principle schematic diagram of the condensing heat recovery system in the refrigeration mode according to the third embodiment of the utility model;

[0031] Figure 9 is a working principle diagram of the condensing heat recovery system in the heating mode according to the third embodiment of the utility model.

[0032] Fig. 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 device; 520, second throttling device; 600, flow control valve; 700, heat recovery heat exchanger; 800, three-way reversing valve. DETAILED DESCRIPTION

[0033] The embodiments of the utility model are described in detail below, and the examples of the embodiments are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the utility model, and cannot be understood as limiting the utility model.

[0034] In the description of the utility model, it is understood that the features limited by "first", "second" can be explicitly or implicitly include one or more of the features. In the description of the utility model, unless otherwise specified, the meaning of "multiple" is two or more.

[0035] In the description of the utility model, it is explained that, unless otherwise specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0036] Condensing heat recovery technology is a technology for improving energy utilization efficiency by effectively recovering heat released in the condensing process. It is widely used in many fields such as heating, ventilation, air conditioning, industrial production and hot water supply due to its advantages of energy saving, environmental protection and economy.

[0037] Currently, condensing heat recovery technology is widely used in most areas of China. For constant temperature and humidity air conditioning equipment used in hospitals, office buildings, libraries, hotels, laboratories, public transportation buildings and production plants, condensing heat recovery technology is usually used. In addition, condensing heat recovery technology is also widely used in environments with hot water demand.

[0038] However, condensing heat recovery technology faces challenges such as high initial investment, complex system integration design and maintenance. In common condensing heat recovery technology, it can be divided into three-pipe heat recovery device, four-pipe heat recovery device and other types. However, the aforementioned heat recovery device has the following problems: large refrigerant pipeline resistance, difficult to control 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 system piping and high cost.

[0039] Based on this, the utility model provides a condensing heat recovery system with stepless temperature adjustment, which can simplify the piping of the system, reduce the manufacturing cost of the system, and arbitrarily adjust the recovery amount of condensing heat, so as to realize precise temperature control through continuous and stepless adjustment, and meet the occasions that require precise temperature control.

[0040] Reference will be made below to Figures 1 to 9 Description of the condensing heat recovery system with stepless temperature adjustment provided according to the utility model embodiment.

[0041] As Figures 1 to 3 shown, the condensing heat recovery system with stepless temperature adjustment according to the utility model embodiment one comprises a compressor 100, a four-way valve 200, a refrigerant flow path, a heat recovery heat exchanger 700 and a flow control valve 600.

[0042] Among them, the compressor 100 as one of the core components, can be compressed into high temperature and high pressure state by doing work way to low temperature and low pressure gaseous refrigerant, and can drive the refrigerant (also known as refrigerant) to circulate in the system, so as to realize 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.

[0043] Two interfaces of the four-way valve 200 are communicated with the inlet 120 and the outlet 110 of the compressor 100 through pipes. It can be understood that the four-way valve 200 has four interfaces, i.e., a first interface, a second interface, a third interface and a fourth interface, wherein the first interface is communicated with the outlet 110 of the compressor 100 through a pipe, so that the high-temperature and high-pressure gaseous refrigerant flows from the outlet 110 of the compressor 100 into the four-way valve 200, and the third interface is communicated with the inlet 120 of the compressor 100 through a pipe, so that the low-temperature and low-pressure gaseous refrigerant flows from the four-way valve 200 into the compressor 100. Through the switching action of the four-way valve 200, the first interface can be switched to be communicated with the second interface or the fourth interface, when the first interface is communicated with the second interface, the third interface is communicated with the fourth interface, and when the first interface is communicated with the fourth interface, the second interface is communicated with the third interface, so that the flow direction of the refrigerant can be changed, and the condensing heat recovery system with stepless temperature adjustment realizes switching between the refrigeration function and the heating function.

[0044] The refrigerant flow path is provided with two paths, and the structure of each refrigerant flow path includes a heat exchanger, a one-way control member and a throttling member. The one-way control member and the throttling member are connected in parallel through pipes, and the one-way control member and the heat exchanger are connected in series through pipes, and the conduction direction of the one-way control member is that the one end of the one-way control member close to the heat exchanger is towards the other end.

[0045] It can be understood that the cut-off direction of the one-way control member is that the one end of the one-way control member away from the heat exchanger is towards the other end, so that the one-way control member 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 member through a pipe, and the refrigerant outlet is connected to the other end of the throttling member through a pipe. When the one-way control member is in the conduction state, the refrigerant first flows through the heat exchanger, and after heat exchange, the refrigerant flows through the one-way control member, at this time, the throttling member is in the non-working state, the refrigerant does not flow into the throttling member, and the refrigerant cannot be subjected to throttling and pressure reduction. When the one-way control member is in the cut-off state, the refrigerant first flows through the throttling member, and after throttling and pressure reduction, the refrigerant flows into the heat exchanger to perform heat transfer, and at this time, the refrigerant cannot flow through the one-way control member. Therefore, the one-way control member controls the switching between the working state and the non-working state of the throttling member, i.e., controls whether the refrigerant is subjected to throttling and pressure reduction, so as to control whether the temperature and pressure state of the refrigerant changes.

[0046] In the embodiment, the throttling component is an expansion valve, such as an electronic expansion valve or a thermal expansion valve. The one-way control component is a one-way valve. Of course, it is not excluded that in other embodiments, the throttling component can be a capillary tube; the one-way control component is an electrically-controlled valve, such as a ball valve, which is in a closed state when the throttling component is switched to the working state, and is in an open state when the throttling component is switched to the non-working state, at which time the flow resistance of the branch in which the electrically-controlled valve is located is much smaller than the flow resistance of the branch in which the throttling component is located, so that the refrigerant flows to the branch in which the electrically-controlled valve is located.

[0047] The other ends of the two heat exchangers are respectively connected to the other two interfaces of the four-way valve 200 through pipes. In the embodiment, the second interface is connected to one end of one of the heat exchangers away from the throttling component through a pipe, and the fourth interface is connected to one end of the other heat exchanger away from the throttling component through a pipe. The two heat exchangers are respectively an evaporator and a condenser, one of which is installed in an indoor environment, and the other of which is installed in an outdoor environment, so as to realize heat transfer between the indoor and outdoor environments.

[0048] It can be understood that, due to the switching control of the four-way valve 200, the infinitely-variable-temperature condensing heat recovery system can be switched between the heating mode and the cooling mode, so that each heat exchanger can be used as an evaporator and a condenser. Specifically, as shown in Figures 1 to 3 Fig. 2, assuming 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 infinitely-variable-temperature condensing heat recovery system is in the heating mode, the first heat exchanger 310 is used as a condenser, at which time the second heat exchanger 320 is used as an evaporator; when the infinitely-variable-temperature condensing heat recovery system is in the cooling mode, the first heat exchanger 310 is used as an evaporator, at which time the second heat exchanger 320 is used as a condenser.

[0049] In the embodiment, for one of the refrigerant flow paths, the heat exchanger is the first heat exchanger 310, the throttling component is the first throttling component 510, and the one-way control component is the first one-way valve 410; for the other refrigerant flow path, the heat exchanger is the second heat exchanger 320, the throttling component is the second throttling component 520, and the one-way control component is the second one-way valve 420.

[0050] The opposite ends of the heat recovery heat exchanger 700 are respectively connected to the ends of the two one-way control components away from the heat exchanger, that is, the heat recovery heat exchanger 700 is connected in series with the two refrigerant flow paths. It can be understood that the heat recovery heat exchanger 700 is used to recover condensing heat, and utilize the condensing heat to heat other medium. For example, the recovered condensing heat can be used to heat low-temperature air of an air conditioning unit, or can be used to heat a heat recovery medium.

[0051] One end of the flow control valve 600 is communicated with one end of the one-way control member on one refrigerant flow path, and the other end of the flow control valve 600 is communicated with the other end of the heat exchanger on the same refrigerant flow path, i.e. the opposite ends of the flow control valve 600 are communicated with the opposite ends of the refrigerant flow path through the pipelines, so that the flow control valve 600 and the refrigerant flow path are connected in parallel.

[0052] In the 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 the 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 the pipeline, the second interface of the four-way valve 200 is the interface a, the fourth interface of the four-way valve 200 is the interface b, the interface a is communicated with the other end of the flow control valve 600 and one end of the second heat exchanger 320 away from the second one-way valve 420 through the pipeline, and the interface b is communicated with one end of the first heat exchanger 310 away from the first one-way valve 410 through the 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 through the above-mentioned pipelines, thereby forming a refrigerant circulation loop.

[0053] 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, and 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 flow control valve 600 is used to control the refrigerant flow through the flow control valve 600 by adjusting the opening degree of the flow control valve 600, thereby controlling the refrigerant temperature and pressure entering the heat recovery heat exchanger 700, and adjusting the condensation heat recovery amount of the heat recovery heat exchanger 700.

[0054] It can be understood that the heat exchanger and the heat recovery heat exchanger 700 can be a finned heat exchanger, a shell-and-tube heat exchanger or a double-pipe heat exchanger, etc. which can meet the heat exchange between the refrigerant and water, air or oil and other media. 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 arranged in different devices and connected through the pipelines.

[0055] In the embodiment, the first heat exchanger 310 is arranged as an evaporator, the second heat exchanger 320 is arranged as a condenser, and the heat recovery heat exchanger 700 and the evaporator are arranged on the indoor side, and the compressor 100, the condenser, the four-way valve 200 and the flow control valve 600 are arranged on the outdoor side.

[0056] Understandably, this configuration allows the stepless temperature-controlled condensing heat recovery system to be designed as a split structure. Only two pipes are needed between the outdoor and indoor sides (the pipe connected to port e of the heat recovery heat exchanger 700, and the pipe connecting the first heat exchanger 310 and port b of the four-way valve 200), namely one return gas pipe and one supply liquid pipe. This makes the stepless temperature-controlled condensing heat recovery system a two-pipe heat recovery device, simplifying the system's piping design, reducing the number of components, facilitating installation and maintenance, and lowering the system's manufacturing cost. The compressor 100 is located on the outdoor side, which avoids the noise generated by the compressor 100 during operation from adversely affecting the indoor environment.

[0057] In the cooling mode of the stepless temperature-regulating condensing heat recovery system, the refrigerant in the first heat exchanger 310 provides cooling capacity to dehumidify and cool the indoor air, while the refrigerant in the heat recovery heat exchanger 700 provides condensing heat to heat the dehumidified air or other media such as domestic water. In the heating mode of the stepless temperature-regulating condensing heat recovery system, the refrigerant in the first heat exchanger 310 provides heating capacity to raise the indoor air temperature, while the refrigerant in the heat recovery heat exchanger 700 provides heating capacity to heat other heat exchange media such as domestic water or to heat the low-temperature air from the air conditioning unit.

[0058] In this embodiment, the stepless temperature-regulating condensing heat recovery system has a cooling mode and a heating mode. The switching action of the four-way valve 200 enables the stepless temperature-regulating condensing heat recovery system to switch between the heating and cooling modes.

[0059] When the stepless temperature-controlled condensing heat recovery system is in cooling mode, the flow control valve 600 is configured to be open and can control its own opening degree to precisely regulate the refrigerant flow rate into the heat recovery heat exchanger 700 through the flow control valve 600.

[0060] Specifically, such as Figure 2 As shown, when the stepless temperature-controlled condensing heat recovery system is running in refrigeration mode, port a of the four-way valve 200 is connected to the first port, port b of the four-way valve 200 is connected to the third port, the first check valve 410 and the second throttling device 520 are in a non-working state, and the compressor 100, the second check valve 420, the first throttling device 510 and the flow control valve 600 are all in a working state. The first heat exchanger 310 acts as an evaporator and the second heat exchanger 320 acts as a condenser.

[0061] 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 from the interface a of the four-way valve 200 is divided into two paths, one of which passes through the flow control valve 600, and the other of which flows into the second heat exchanger 320. The high-temperature and high-pressure refrigerant in the second heat exchanger 320 becomes high-pressure and medium-temperature refrigerant after completing heat transfer to the outside, and then flows through the second check valve 420 and is combined with the high-pressure and high-temperature refrigerant flowing through the flow control valve 600 to flow into the heat recovery heat exchanger 700.

[0062] 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, causing the refrigerant to become high-pressure and medium-temperature refrigerant, and at the same time, realizing effective recovery and utilization of condensation heat. Then, the high-pressure and medium-temperature refrigerant becomes 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 be heated and evaporated, thereby changing into low-temperature and low-pressure gas. Finally, the refrigerant after absorbing heat flows to the interface b of the four-way valve 200 and returns to the inlet 120 of the compressor 100, thereby completing a refrigerant flow cycle.

[0063] During the operation of the infinitely variable temperature condensation heat recovery system in the refrigeration mode, the opening of the stepless adjustment flow control valve 600 can be adjusted to adjust the refrigerant flow ratio flowing to the second heat exchanger 320 and flowing to the flow control valve 600, thereby controlling the temperature and pressure of the refrigerant flowing into the heat recovery heat exchanger 700, realizing accurate control of the heat recovery amount of the heat recovery heat exchanger 700, and achieving the purpose of infinitely variable temperature.

[0064] When the infinitely variable temperature condensation heat recovery system is in the heating mode, the flow control valve 600 is configured in the closed state.

[0065] Specifically, as shown in Figure 3 When the infinitely variable temperature condensation heat recovery system operates in the heating mode, the interface a of the four-way valve 200 is connected to the third interface, the interface b of the four-way valve 200 is connected to the first interface, the second check valve 420, the first throttling member 510 and the flow control valve 600 are in the non-working state, the compressor 100, the first check valve 410 and the second throttling member 520 are in the working state, the first heat exchanger 310 acts as a condenser, and the second heat exchanger 320 acts as an evaporator.

[0066] The high-temperature, high-pressure refrigerant flows out from outlet 110 of compressor 100 and into the first port of four-way valve 200. The refrigerant flowing out from port b of four-way valve 200 flows directly into the first heat exchanger 310. After heating the indoor air, it becomes high-pressure, medium-temperature refrigerant and flows into heat recovery heat exchanger 700 through first one-way valve 410. In heat recovery heat exchanger 700, the high-pressure, medium-temperature refrigerant transfers heat with the medium flowing through heat recovery heat exchanger 700, causing the temperature of the refrigerant to drop further, thereby realizing the recovery and utilization of condensation heat.

[0067] Next, the refrigerant flowing out of the heat recovery heat exchanger 700 will be throttled and depressurized after passing through the second throttling element 520, thus becoming a low-temperature, low-pressure refrigerant. The low-temperature, low-pressure refrigerant will absorb heat during its flow through the second heat exchanger 320 and become a low-temperature, low-pressure gas. Finally, the refrigerant that has absorbed heat and evaporated will flow to the port a of the four-way valve 200 and return to the inlet 120 of the compressor 100, thus completing one refrigerant flow cycle.

[0068] It is understood that the stepless temperature-regulating condensing heat recovery system provided in Embodiment 1 can realize the recovery and utilization of condensing heat in both cooling and heating modes. Moreover, in cooling mode, the amount of condensing heat recovered can be arbitrarily adjusted by means of the flow control valve 600. The recovered condensing heat can be used to heat the low-temperature air of the air conditioning unit, or it can be used to heat the heat recovery medium, and the amount of condensing heat recovered is adjustable.

[0069] like Figures 4 to 6 As shown, the stepless temperature-regulating condensing heat recovery system according to Embodiment 2 of this utility model has the same components as Embodiment 1. The difference between Embodiment 2 and Embodiment 1 is that the connection method of the flow control valve 600 is different.

[0070] In Embodiment 1, the flow control valve 600 is connected in parallel with one of the refrigerant flow paths. However, in Embodiment 2, one end of the flow control valve 600 is connected to the end of the one-way control element on one of the refrigerant flow paths away from the heat exchanger, and the other end of the flow control valve 600 is connected to the outlet 110 of the compressor 100.

[0071] In this embodiment, one end of the flow control valve 600 is connected to the outlet 110 of the compressor 100 via a pipeline, and the other end of the flow control valve 600 is connected to the refrigerant outlet of the second check valve 420 via a pipeline.

[0072] Example 2 has the same technical effect as Example 1, and will not be described again here. Figure 3 and Figure 6 As shown, the operation process of Embodiment 1 and Embodiment 2 in heating mode is the same, and will not be repeated here. Figure 2 and Figure 5As shown, the operation process of Embodiment 1 and Embodiment 2 in refrigeration mode is basically the same. The only difference is that the refrigerant flowing out of the outlet 110 of the compressor 100 is diverted before or after flowing into the four-way valve 200.

[0073] Specifically, compared to Embodiment 1, when the stepless temperature-regulating condensing heat recovery system provided in Embodiment 2 operates in 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 refrigerant will flow through the flow control valve 600, and the other path of refrigerant will flow into the four-way valve 200 through the first interface of the four-way valve 200, and then flow to the second heat exchanger 320 through the interface a of the four-way valve 200.

[0074] like Figures 7 to 9 As shown, the stepless temperature-regulating condensing heat recovery system according to Embodiment 3 of this utility model differs from Embodiment 2 in that: the stepless temperature-regulating condensing heat recovery system of Embodiment 3 further includes a three-way reversing valve 800.

[0075] Furthermore, the two ends of the flow control valve 600 are connected to the outlet 110 of the compressor 100 and the inlet of the three-way reversing valve 800, respectively, and the two outlets of the three-way reversing valve 800 are connected to the two ends of the heat recovery heat exchanger 700, respectively.

[0076] In this embodiment, the three-way reversing valve 800 has one inlet and two outlets, namely interface c and interface d. One end of the flow control valve 600 is connected to the outlet 110 of the compressor 100 via a pipeline, and the other end of the flow control valve 600 is connected to the inlet of the three-way reversing valve 800 via a pipeline. Interface c of the three-way reversing valve 800 is connected to port e of the heat recovery heat exchanger 700 and the refrigerant outlet of the second check valve 420 via a pipeline. Interface d of the three-way reversing valve 800 is connected to port f of the heat recovery heat exchanger 700 and the refrigerant outlet of the first check valve 410 via a pipeline.

[0077] It is understandable that the three-way reversing valve 800 is an electric valve. Through the switching action of the three-way reversing valve 800, the inlet port is connected to interface c or interface d, thereby controlling the flow direction of the refrigerant flowing out of the flow control valve 600.

[0078] The stepless temperature-regulating condensing heat recovery system provided in Embodiment 3 has a cooling mode and a heating mode. By controlling the action of the four-way valve 200, the stepless temperature-regulating condensing heat recovery system can select between the heating mode and the cooling mode.

[0079] When the stepless temperature-regulating condensing heat recovery system is in cooling mode, the flow control valve 600 is configured to be open and can control its own opening degree to precisely regulate the refrigerant flow to the three-way reversing valve 800. At the same time, the three-way reversing valve 800 is configured to open one of its output ports so that the refrigerant flowing through the three-way reversing valve 800 can flow into the heat recovery heat exchanger 700.

[0080] Specifically, such as Figure 8 As shown, when the stepless temperature-regulating condensing heat recovery system operates in refrigeration mode, port a of the four-way valve 200 is connected to the first port, port b of the four-way valve 200 is connected to the third port, port c of the three-way reversing valve 800 is connected to the inlet port, port d of the three-way reversing valve 800 is in the closed state, the first one-way valve 410 and the second throttling element 520 are in the non-working state, and the compressor 100, the second one-way valve 420, the first throttling element 510 and the flow control valve 600 are all in the working state. The first heat exchanger 310 acts as an evaporator and the second heat exchanger 320 acts as a condenser.

[0081] The high-temperature, high-pressure refrigerant is discharged from outlet 110 of compressor 100 and split into two streams. One stream flows to flow control valve 600, and the other stream flows to the first port of four-way valve 200. The refrigerant flowing out from port a of four-way valve 200 flows into the second heat exchanger 320, where it is cooled and becomes high-pressure, medium-temperature refrigerant, which then passes through the second check valve 420. At the same time, the refrigerant flowing out from flow control valve 600 flows into three-way reversing valve 800 and flows out from port c of three-way reversing valve 800. Then, it merges with the high-pressure, medium-temperature refrigerant flowing out from the second check valve 420 and flows into heat recovery heat exchanger 700.

[0082] The refrigerant within the heat recovery heat exchanger 700 absorbs its own heat, causing the medium flowing through it to cool down and become a high-pressure, medium-temperature refrigerant. This process effectively recovers and utilizes condensation heat. Then, the high-pressure, medium-temperature refrigerant, after being throttled and depressurized by the first throttling element 510, becomes a low-temperature, low-pressure refrigerant and flows into the first heat exchanger 310. In the first heat exchanger 310, the refrigerant absorbs heat and evaporates, transforming into a low-temperature, low-pressure gas. Finally, the refrigerant, having absorbed heat, flows back to the compressor 100 inlet 120 via port b and the third port of the four-way valve 200, completing one refrigerant flow cycle.

[0083] During the operation of the stepless temperature control condensing heat recovery system in the refrigeration mode, the opening degree of the stepless control flow valve 600 can be adjusted to control the refrigerant flow ratio to the second heat exchanger 320 and the stepless control flow valve 600, thereby controlling the refrigerant temperature and pressure flowing into the heat recovery heat exchanger 700, achieving accurate control of the heat recovery amount of the heat recovery heat exchanger 700, and achieving the purpose of stepless temperature control.

[0084] When the stepless temperature control condensing heat recovery system is in the heating mode, the stepless control flow valve 600 is configured in the open state, and the opening degree can be controlled to accurately adjust the refrigerant flow to the three-way reversing valve 800. At the same time, the three-way reversing valve 800 is configured to conduct another output port to make the refrigerant flow through the three-way reversing valve 800 into the heat recovery heat exchanger 700.

[0085] Specifically, as shown in Figure 9 When the stepless temperature control condensing heat recovery system is in the heating mode, the interface a of the four-way valve 200 is connected to the third interface, the interface b of the four-way valve 200 is connected to the first interface, the interface d of the three-way reversing valve 800 is connected to the input port, the interface c of the three-way reversing valve 800 is in the closed state, the second one-way valve 420 and the first throttling device 510 are in the non-working state, the compressor 100, the first one-way valve 410, the second throttling device 520, and the stepless control flow valve 600 are in the working state, the first heat exchanger 310 is used as a condenser, and the second heat exchanger 320 is used as an evaporator.

[0086] 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 of which will flow into the stepless control flow valve 600, and the other 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 become high-pressure and medium-temperature refrigerant after being heated by the indoor air, and then flow out through the first one-way valve 410; at the same time, the refrigerant flowing out of the stepless control flow valve 600 will flow into the three-way reversing valve 800, and then flow out through the interface d of the three-way reversing valve 800, and then, the high-pressure and medium-temperature refrigerant flowing out of the first one-way valve 410 will be combined, and then flow into the heat recovery heat exchanger 700.

[0087] The refrigerant flowing through the heat recovery heat exchanger 700 exchanges heat with the medium flowing through the heat recovery heat exchanger 700, so that the temperature of the refrigerant is lowered, the refrigerant becomes high-pressure medium-temperature refrigerant, and the effective recovery and utilization of condensation heat is realized. Then, the refrigerant flowing out of the heat recovery heat exchanger 700 is throttled and depressurized after flowing through the second throttling device 520, thereby becoming low-temperature low-pressure refrigerant; then, the low-temperature low-pressure refrigerant absorbs heat and evaporates during the process of flowing through the second heat exchanger 320, thereby becoming low-temperature low-pressure gas; finally, the refrigerant after heat absorption and evaporation flows into the four-way valve 200 through the interface a of the four-way valve 200, and returns to the inlet 120 of the compressor 100 through the third interface of the four-way valve 200, so as to complete one refrigerant flow cycle.

[0088] During the operation of the infinitely variable temperature condensation heat recovery system in the heating mode, the opening degree of the flow control valve 600 is continuously adjusted to adjust the refrigerant flow ratio flowing to the first heat exchanger 310 and flowing to the flow control valve 600, thereby controlling the temperature and pressure of the refrigerant flowing into the heat recovery heat exchanger 700, realizing accurate control of the heat recovery amount of the heat recovery heat exchanger 700, and finally achieving the purpose of infinitely variable temperature.

[0089] It can be understood that the infinitely variable temperature condensation heat recovery system provided by Embodiment Three can realize condensation heat recovery in the dual working conditions of the refrigeration mode and the heating mode, can arbitrarily adjust the recovery amount of condensation heat through the flow control valve 600, and has simplified pipelines and reduced the number of components, thereby reducing the manufacturing cost of the system and making the infinitely variable temperature condensation heat recovery system have the advantage of high cost performance.

[0090] The recovered condensation heat can be used to heat and warm the low-temperature air of the air conditioning unit, or can be used to heat the heat recovery medium, and the recovery amount of the condensation heat is adjustable.

[0091] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", 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 application. In the present application, the exemplary description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0092] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and purposes of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. An infinitely variable temperature controlled condensing heat recovery system, characterized by, Comprise: a compressor; a four-way valve, two interfaces of which are communicated with an inlet and an outlet of the compressor respectively; two refrigerant flow paths, each of which comprises 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 in series with one end of the heat exchanger, the conducting direction of the one-way control member is from the one end of the heat exchanger close to the one-way control member to the other end, the other ends of the two heat exchangers are communicated with the other two interfaces of the four-way valve respectively, the two heat exchangers are evaporator and condenser respectively; a heat recovery heat exchanger, two ends of which are communicated with the ends of the two one-way control members away from the heat exchangers respectively; a flow control valve, one end of which is communicated with the end of the one-way control member on one of the refrigerant flow paths away from the heat exchanger, the other end of which is communicated with the other end of the heat exchanger on the same refrigerant flow path or the outlet of the compressor.

2. The condensing heat recovery system of claim 1, wherein, The infinitely variable temperature condensing heat recovery system has a refrigeration mode, the flow control valve is configured in an open state, and the opening degree can be controlled to adjust the refrigerant flow rate flowing into the heat recovery heat exchanger through the flow control valve.

3. The continuously variable temperature- conditioned condensing heat recovery system of claim 2, wherein, The infinitely variable temperature condensing heat recovery system has a heating mode, the flow control valve is configured in a closed state.

4. The continuously variable temperature- conditioned condensing heat recovery system of claim 1, wherein, Further comprise a three-way reversing valve, two ends of the flow control valve are communicated with the outlet of the compressor and the input port of the three-way reversing valve respectively, two output ports of the three-way reversing valve are communicated with two ends of the heat recovery heat exchanger respectively.

5. The continuously variable temperature- conditioned condensing heat recovery system of claim 4, wherein, The infinitely variable temperature condensing heat recovery system has a refrigeration mode, the flow control valve is configured in an open state, and the opening degree can be controlled to adjust the refrigerant flow rate flowing to the three-way reversing valve, the three-way reversing valve is configured to conduct one of the output ports to make the refrigerant flowing through the three-way reversing valve flow into the heat recovery heat exchanger.

6. The continuously variable temperature- conditioned condensing heat recovery system of claim 5, wherein, The infinitely variable temperature condensing heat recovery system has a heating mode, the flow control valve is configured in an open state, and the opening degree can be controlled 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 to make the refrigerant flowing through the three-way reversing valve flow into the heat recovery heat exchanger.

7. The continuously variable temperature- conditioned condensing heat recovery system of claim 1, wherein, The throttling member is an expansion valve.

8. The continuously variable temperature- conditioned condensing heat recovery system of claim 1, wherein, The flow control valve is an electric ball valve.

9. The continuously variable temperature- conditioned condensing heat recovery system of claim 1, wherein, The one-way control member is a one-way valve.

10. The continuously variable temperature- conditioned condensing heat recovery system of claim 1, wherein, 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.

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